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The human cardiovascular system

Grade 6 science worksheets.

The heart and the circulatory system make up the human cardiovascular system. It is the transport system of the body that helps in circulating substances in blood. Blood delivers oxygen and nutrients to every cell and removes carbon dioxide and waste products made by those cells. This tubular system comprising of blood vessels is propelled by a pumping heart.

The human cardiovascular system comprises of two circuits – pulmonary and the systemic and they consist of arterial, capillary and venous components. Put your knowledge to the test with this challenging  6th Grade Science Worksheet ! Read each question carefully and choose the response that you feel is correct.

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Pulmonary and systemic circuits

During breathing, the air we inhale reaches our lungs, which is then carried by blood vessels to the heart. The heart pumps it further to all the cells in various parts of the body. The carbon dioxide from the cells is then carried by another set of blood vessels to the heart that pumps it back to the lungs for exhalation. This can be divided into two circuits for easier study – Doubts? A  6th-grade science tutor  can help.

A) The pulmonary circuit (between lungs and the heart)

The pulmonary (related to lungs) circuit is that part of the circulatory system that carries oxygen rich (or oxygenated) blood from the lungs to the heart and carbon dioxide rich (or deoxygenated) blood from the heart to the lungs.

worksheet circulatory system grade 6

B) The systemic circuit (between heart and the rest of the body)

It is that part of the circulatory system that carries oxygenated blood away from the heart, delivers to organs, tissues and cells and returns deoxygenated blood from the cells back to the heart.

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Heart is a muscular organ that pumps blood through the network of arteries and veins. It usually beats 60-100 times in a minute. It has four chambers – two atria on top and two ventricles at the bottom.

Ventricles pump blood out of the heart. The two chambers are divided by a wall known as interventricular septum. Atria receive blood entering the heart. A wall called interatrial septum separates the two atria. The atria are separated from the ventricles by the valves known as tricuspid valve and mitral valve for the right and left side respectively.

worksheet circulatory system grade 6

Function of the chambers

  • The right atrium receives blood from the veins and pumps it to the right ventricle.
  • The right ventricle receives blood from the right atrium and pumps it to the lungs for oxygenation.
  • The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle.
  • The left ventricle which is the strongest chamber pumps this oxygen-rich blood to the rest of the body. Its vigorous contractions create our blood pressure.

worksheet circulatory system grade 6

Blood vessels

There are three main types of blood vessels –.

Arteries, Capillaries and Veins.

Arteries –

Arteries are the blood vessels that carry blood away from the heart to all parts of the body (tissues, lungs, brain etc.). Most of the arteries carry oxygenated blood. The Aorta is the largest artery in the body that originates in the heart and distributes oxygenated blood to all the parts of the body. Arteries carry blood at higher pressure due to pumping of the heart. The thicker walls in arteries help them to withstand the pressure.

Exception: The Pulmonary Arteries carry deoxygenated blood from the heart to the lungs for removal from the body during exhalation.

Capillaries –

Capillaries are very thin blood vessels that form networks throughout the bodily tissues. They form the destination of the arterial blood from the heart and starting point for venous blood that goes back to the heart. They facilitate the exchange of oxygen, nutrients and wastes between the blood and the tissues.

worksheet circulatory system grade 6

Veins –

Veins are the blood vessels that carry blood towards the heart. Most veins carry deoxygenated blood from the cells back to the heart. The blood flows at lower pressure in the veins and its walls are thinner. Veins have valves present in them to stop the blood from flowing back as they mostly travel against gravity. Veins are present closer to the surface of the skin as compared to arteries that are deeper.

Exception: The Pulmonary Veins carry oxygenated blood from the lungs to the heart for further circulation in the body.

worksheet circulatory system grade 6

Blood and its components

Blood is the transport liquid, which is both a tissue and a fluid. There are four main components of blood – plasma, red blood cells, white blood cells and platelets.

Plasma is the liquid portion of the blood. It is yellowish in color and is mostly made up of water. It also contains proteins, glucose, hormones and minerals.  It transports water and nutrients to body tissues. It also transports carbon dioxide from the cells for their removal.

Plasma has three types of cells suspended in it –

1) red blood cells –.

They form 45% of the blood volume. They contain an iron-containing protein called hemoglobin that helps in carrying oxygen. When hemoglobin is attached to oxygen it brightens in color and when oxygen is removed, it darkens in appearance.  Arteries that carry oxygen thus, appear red.  After oxygen is delivered in tissues, the blood enters the veins and thus veins appear darker.

2) White Blood Cells –

They account for just 1% of the blood but they are crucial for our existence. They ensure good health and protect us from diseases and ailments by attacking foreign bodies like viruses and bacteria.

3) Platelets –

The smallest of the blood cells, they control bleeding. When there is a wound, they form a cluster around the wound and plug it until it heals.

Check point

  • Name the artery that carries carbon dioxide rich blood from the heart to the lungs.
  • Name the protein in red blood cells that binds with oxygen and carries it.
  • The three types of cells in blood are _____________.
  • Name the valve between the right atrium and the right ventricle.
  • Which blood cells help us fight against a viral disease like Covid-19?
  • How does the excretory system work with the cardiovascular system?
  • Pulmonary Artery
  • Red Blood Cells, White Blood Cells and Platelets
  • Tricuspid valve
  • White Blood Cells
  • All of your body’s organs, including the kidneys, are supplied with oxygen-rich blood by the heart. The kidneys clean the blood by removing waste products and excess water.

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Circulatory system.

Circulatory System

Your heart pumps blood to every nook and cranny in your body. The average heart beats approximately 72 times each minute. It weighs nine to eleven ounces in females and just an ounce or two more in males. In your lifetime, your heart will beat approximately 2.5 billion times.

Many children are aware of their heart. They can feel it beating in their chest. They can feel it race after recess on the playground and they can feel it jump when they're startled. This is the perfect place to start a unit on the circulatory system.

Teaching the Circulatory System to Your Young Students

While the heart is the center of the circulatory system, it's not alone. You have arteries, veins and of course, the blood that courses through them. Teaching the circulatory system can be fun. Watching children become more aware of their bodies and engaged in how it works can be an enriching experience. The circulatory system can be a single unit or it can be part of a larger unit on health and/or the human body.

Teacher Planet offers a variety of teaching resources to help make teaching the circulatory system simple and enjoyable. You'll find lesson plans, activities, worksheets and additional teaching resources all designed to help you bring the circulatory system alive in your classroom.

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The Circulatory System (Year 6)

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This PowerPoint will help children learn about the human circulatory system. It includes all the key information about the main parts of the circulatory system and how they function collectively. The recap quiz at the end is great for testing children’s understanding of what they have learnt.

  • Key Stage: Key Stage 2
  • Subject: Science
  • Topic: Animals, Including Humans
  • Topic Group: Living Things
  • Year(s): Year 6
  • Media Type: PowerPoint
  • Resource Type: Front-of-Class Teaching
  • Last Updated: 29/09/2022
  • Resource Code: S2PAT17

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Human Anatomy Notebook

Free Circulatory System Worksheets and Printables

By Sara Dennis on October 21, 2021

If you are learning about the human body and anatomy and physiology in your homeschool, you are going to love the theme of the free printables we have been offering recently. These free circulatory system worksheets will help you easily teach your children all about the human circulatory system.

Circulatory System with text overlay free circulatory system worksheets

Human Body Worksheets

Our team has been busy creating many resources on the human body and the human body system, such as human body worksheets. If you enjoy learning with science unit studies you are going to love all the freebies and round-ups we are working on!

You may have seen our post on Free Printables for Apologia’s Elementary Anatomy Book where we had all the freebies organized by lesson in the book. I am going to be doing the same thing in this new series where each post is focusing on a vital system of the human body.

These will be great to accompany the Apologia Anatomy and Physiology book as well as any human body unit study.

The Human Circulatory System

Today we are focusing on the circulatory system which is an important network of organs and vessels responsible for the flow of all our blood, nutrients, hormones, oxygen and gases to and from our cells.

Learning about this body system includes studying blood type, the function of blood, and the heart. Kids will see how the respiratory system works alongside the circulatory system to provide food and oxygen to the body cells.

Free Circulatory System Worksheets:

Circulatory system worksheets are a great way for kids to learn about the human body. Kids can color, label parts, and match vocabulary words with their definitions. Plus kids will learn about the flow of blood not only through the heart but the rest of the body. Check out all the great printables below and download a circulatory system diagram worksheet you can use in your homeschool today. 

Circulatory Worksheets for Kids – These fun cardiovascular system worksheets not only help kids label the parts of the cardiovascular system but also cover how blood flows through the body.

Circulatory System Matching Worksheet – This worksheet has kids match the vocabulary words with the definition. For example, kids will need to match red blood cells with the part of blood that carries oxygen and white blood cells with the part of blood that fights infection.

Circulation Station Coloring Page – This coloring page has kids color the flow of blood throughout the body. There are two pictures side by side. One is of the arteries and the other shows the veins.

Circulatory System Worksheets, Video and Quiz – This link includes not only worksheets, a video, and a quiz, but also an interactive activity that kids can complete on any device.

Heart Anatomy Clip Art, Coloring Pages, Labeling Worksheets and More – You’ll find a collection of clip art, coloring pages, labeling worksheets, and more. It’s a great way to introduce kids to the left ventricle, the right ventricle, the left atrium, and the right atrium. Kids will also see the pathway of blood as the heart pumps.

The Inner Body Website   Cardiovascular System with interactive maps and information. The information includes an explanation of pulmonary circulation. These circulation worksheets also show some of the smaller blood vessels.

human body systems labeling and diagramming circulatory system 4th-7th grade

Study the Anatomy of the Heart

A study of the circulatory system needs a detailed study of the anatomy of the heart. These worksheets will help your kids learn the parts of the heart as they label and color the different parts of the heart.

Our Human Body Systems Labeling and Diagramming Worksheets have an Instant Download for the Circulatory System . This will help your children memorize the different parts of the circulatory system by using the free labels included.

Inside Out Anatomy Circulation Worksheet – This worksheet gives you a look into pulmonary circulation and the path of oxygen-rich blood through the heart.

Awesome Anatomy Heart Diagram Worksheet – The Awesome circulatory system diagram worksheet gives children the chance to color the heart as they learn about the different parts.

Heart Labeling Worksheet – This worksheet shows the path of blood through the heart and lungs. Kids see how carbon dioxide is removed and the blood is enriched with oxygen. It’s a great addition to your study of the circulatory system.

Diseases of the Circulatory System – This research notebook will help students learn about aneurysms, arteriosclerosis, blood clots, congestive heart failure, coronary heart disease, heart attack, and high blood pressure.

Circulatory System Lesson Plans

If you’re looking for circulatory system lesson plans, then you’ll love these links. These lesson plans include videos, activities, and notebooking pages. You’ll find everything you need to teach your kids about the human circulatory system.

Introduction to the Circulation System Lesson Plans – You’ll find a series of lesson plans that walk kids through learning about the human circulatory system. Kids will make a stethoscope, learn about heart disease, and discuss the definition of heart terms such as heart attack and heartthrob.

Circulatory System Lesson Plans with video links – These lesson plans include having kids draw a heart and the pathway of blood through it, how heart disease can require a transplant, and researching artificial hearts and their design.

Kids Guide to the Circulatory Series  – The Kids Guide to the Circulatory System is put together by Pacific Medical Training. You’ll find lesson plans, activities, information about the heart, and more.

We love using notebooking alongside any topic or unit study. We have created a Free Diseases of the Circulatory System Notebooking Research Journal to go along with this study. Your children will take a look at eight common circulatory system diseases that can plague the body. Your students will learn about this body system by studying what can go wrong with it!

Circulatory System Notebooking Pages – You’ll find several different notebooking pages that help kids learn about the functions of the circulatory system.

The Circulation Game – This fun game for 2-6 players demonstrates the function of the circulatory system as kids move blood cells, food, and waste tokens to their goals.

Human Anatomy Notebook

Explore the body with this awesome  human anatomy notebook ! It’s an easy way for students in grades 5 and up to learn about human anatomy independently. 

human anatomy notebook

Other Human Anatomy Worksheets:

These free printables are a great addition to learning about the various systems of the human body. You’ll find worksheets for labeling each body system, checking your kids’ reading comprehension, and learning vocabulary.

Human Body Systems Labeling Sheets includes printable anatomy labeling worksheets for every body system, with answers included.

Human Body Systems Vocabulary Copywork Notebook   includes 78 pages of body systems vocabulary to copy and remember.

Free Human Anatomy Coloring Pages for Students

A fun way to introduce your kids to anatomy is with coloring pages. We have listed out some  science coloring pages  that are great for kids of all ages. You’ll find human  anatomy coloring pages  for all the major systems of the body, as well as additional anatomy and physiology worksheets. 

free human anatomy coloring pages

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Sara Dennis is a veteran homeschool mom of six who’s still homeschooling her two youngest kids after the older four have graduated, entered college, and moved on to adult life. She blogs at Classically Homeschooling .

worksheet circulatory system grade 6

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Circulatory Activity Sheet

Grade 6 Science Module: The Human Body Systems (Respiratory System, Circulatory System & Nervous System)

This Self-Learning Module (SLM) is prepared so that you, our dear learners, can continue your studies and learn while at home. Activities, questions, directions, exercises, and discussions are carefully stated for you to understand each lesson.

Each SLM is composed of different parts. Each part shall guide you step-by-step as you discover and understand the lesson prepared for you.

Pre-tests are provided to measure your prior knowledge on lessons in each SLM. This will tell you if you need to proceed on completing this module or if you need to ask your facilitator or your teacher’s assistance for better understanding of the lesson. At the end of each module, you need to answer the post-test to self-check your learning. Answer keys are provided for each activity and test. We trust that you will be honest in using these.

Please use this module with care. Do not put unnecessary marks on any part of this SLM. Use a separate sheet of paper in answering the exercises and tests. And read the instructions carefully before performing each task.

If you have any questions in using this SLM or any difficulty in answering the tasks in this module, do not hesitate to consult your teacher or facilitator.

This module was designed and written with you in mind. It is here to help you master the matter. The scope of this module permits it to be used in many different learning situations. The language used recognizes the diverse vocabulary level of students. The lessons are arranged to follow the standard sequence of the course. But the order in which you read them can be changed to correspond with the module you are now using.

The module is about:

  • Lesson 1 – Respiratory System
  • Lesson 2 – Circulatory System
  • Lesson 3 – Nervous System

After going through this module, you are expected to be able to:

  • identify the different organs of the respiratory system, circulatory system, and nervous system;
  • describe the parts and functions of each organ of the respiratory system, circulatory system and nervous system;
  • explain how the organs of each organ system work together.

Grade 6 Science Quarter 2 Self-Learning Module: The Human Body Systems (Respiratory System, Circulatory System & Nervous System)

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Grade 6 On Circulatory System

Displaying top 8 worksheets found for - Grade 6 On Circulatory System .

Some of the worksheets for this concept are Work on circulatory system for grade 6, Circulatory system grade 6 work, What is the circulatory system, Grade 6 basic life science, The circulatory system, Lesson, Circulatory system activities, Functions of the circulatory system.

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1. Worksheet on circulatory system for grade 6

2. circulatory system grade 6 worksheet, 3. what is the circulatory system, 4. grade 6 basic life science, 5. the circulatory system, 6. lesson 1.1, 7. circulatory system activities, 8. functions of the circulatory system.

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Blood Flow Through Heart

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circulatory system grade 6

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11 questions

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Name the blood vessel that carry oxygenated blood away from the heart

capillaries

De-oxygenated blood goes from body parts to _____

How many chambers does the heart have?

The movement of blood through the heart and body is called:

circulation

respiration

The beating sound your heart makes comes from:

blood going in the wrong direction

valve closing

heart skipping beats

your ears playing tricks on you

with circulation the heart provides your body with

a way of getting rid of waste products

all of the above

What parts act like doors that control blood flow in the heart?

What organ removes waste from blood?

lungs and kidneys

You can keep your heart strong by:

by eating heart shape candy

Doing activities, like playing outside, riding your bike, and swimming

Sleeping 18 hours a day

These are tubes that carry blood back to the heart:

these are the tubes that exchange gases

none of the above

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Circulatory System Grade 6

Circulatory System Grade 6 - Displaying top 8 worksheets found for this concept.

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ICSE Solutions

Selina Concise Biology Class 6 ICSE Solutions – The Circulatory System

ICSE Solutions Selina ICSE Solutions ML Aggarwal Solutions

APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 6 Biology. You can download the Selina Concise Biology ICSE Solutions for Class 6 with Free PDF download option. Selina Publishers Concise Biology for Class 6 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines.

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Selina Concise ICSE Solutions for Class 6 Biology Chapter 6 The Circulatory System

Multiple Choice Questions: 1. Put a tick mark (✓) against the correct alternative in the following statements: (a) Function of WBCs is to (i) Transport oxygen (ii) Help in clotting of blood (iii) Provide immunity (iv) Provide storage of food.

(b) Blood Capillary is a (i) Broad tube (ii) Artery with thick wall (iii) Vein with large lumen (iv) Narrow tube made up of endothelium only.

(c) Nucleus is absent in (i) RBCs (ii) VBCs (iii) All blood cells (iv) Liver cells.

(d) The only artery which carries deoxygenated blood is called, (i) Hepatic artery (ii) Pulmonary artery (iii) Aorta (iv) Renal artery

(e) Sphygmomanometer ni’sures (i) Pulse rate (ii) Heart beat (iii) Blood pressure (iv) Brain activity

(f) Pulmonary vein carries (i) Oxygenated blood (ii) Deoxygenated blood (iii) Glucose-rich blood (iv) C02 laden blood

(g) The blood tastes saltish due to the dissolved: (i) Sodium chloride (ii) Potassium chloride (iii) Ammonium nitrate (iv) Sodium nitrate

Short Answer Questions:

1. Differentiate between the following pair of terms: Question 1(a) Patelets and WBC Answer: Platelets

  • These are colourless, oval or round, cytoplasmic fragments found floating in the blood.
  • These play a major role in blood clotting.
  • Their life span is 3-5 days and it is called thrombocytes.
  • WBC are colourless and lack haemoglobin, larger in quantity, and have distinct oval and lobed nucleus.
  • They prevent body from disease causing germs by providing immunity
  • Their life span is short i.e. 5 to 20 days.

Question 1(b) Pulmonary artery and pulmonary vein Answer: Pulmonary artery

  • This involves circulation of blood from the heart to the lungs.
  • It carries deoxygenated blood.

Pulmonary vein

  • This involves circulation of blood to the heart from the lungs.
  • It carries oxygenated blood.

Question 1(c) Vena Cava and Aorta Answer: Vena Cava

  • Vena Cava is a large vein.
  • It carries deoxygenated blood from the upper and lower parts of the body i.e. head and shoulders.
  • Aorta is the large artery.
  • It carries oxygenated blood to all parts of the body through its branches.

Question 1(d) RBC and WBC Answer: RBC

  • They do not have nucleus at maturity.
  • They possess haemoglobin and are red.
  • They help in transport of respiratory gases.
  • They have a large characteristic nucleus.
  • They are colourless as they have no pigment.
  • They help in defence mechanism.

Question 2. Give any three differences between an artery and a vein: Answer: Following are the differences between the artery and a vein: Artery

  • Arteries carry blood from the heart to various body parts.
  • These carry oxygenated blood (except the pulmonary artery).
  • Blood flows with high speed and under high pressure.
  • Veins carry blood from different body parts to the heart.
  • These carry deoxygenatec blood (except the pulmonary vein).
  • Blood flows with low speech and under low pressure.

Question 3. Blood consists of two parts — a liquid part and a cellular part. Name these parts and briefly write about them. Answer:

  • Water- 90-92%
  • Proteins – 7-8%
  • Inorganic salts – 1%
  • Other substances – traces
  • Red blood cells (erythrocytes)
  • White blood cells (leukocytes)
  • Blood platelets (thrombocytes)

Question 4. What is the role of haemoglobin in the blood ? Answer: The haemoglobin is the respiratory pigment which is formed of the iron containing part known as haemin and protein part known as globin. It helps to transport respiratory gases (oxygen).

5. Fill in the blanks with suitable words given below:

  • The colour of a red blood cell is due to haemoglobin .
  • The two lower chambers of the heart are called ventricles.
  • The blood plasma contains a dissolved substance such as nutrient, proteins , waste products and harmones .
  • The pulmonary artery takes the blood from the ventricles to the lungs.
  • The instrument used to find out the blood pressure is known as sphygmomanometer .
  • The blood loaded with carbon dioxide from the body comes into the right auricle of the heart.
  • The oxygen-rich blood from the lungs comes into the left ventricle of the heart.
  • The oxygen-rich blood is pumped into different parts of the body through aorta .
  • The carbon dioxide loaded blood from right ventricle is pumped into the lungs through pulmonary artery.
  • The liquid part of coagulated blood is known as serum .

Question 6. In which organ of our body does blood get oxygenated? Answer: Blood becomes oxygenated in the lungs. The oxygenated blood is returned to left verticles by the pulmonary vein.

Question 7. Which side of the heart (left or right) contains oxygenated blood? Answer: The left side of the heart contains oxygenated blood.

Question 8. Name the disease in which the number of platelets reduces to 25,000 – 30,000 per cubic mm of blood. State its major symptoms. Answer: Dengue fever is one such disease in which the number of platelets get reduced to as low as 25-30 thousands per cubic mm of blood. The major symptoms of dengue are high fever, rashes or red spots on body, nausea or vomiting, pain in abdomen, back, or back of the eyes and muscles.

Long answer Questions

Question 1. Name the three kinds of blood vessels found in human beings. With the help of suitable diagrams, differentiate between them. Answer: The three kind of blood vessels found in human beings are arteries, veins and capillaries.

  • Arteries are the blood vessels that carry blood from the heart to the various parts of the body.
  • Veins are the blood vessels that carry blood from the body parts to the heart.

Selina Concise Biology Class 6 ICSE Solutions - The Circulatory System 1

Differences: Arteries

  • Carry blood away from the heart.
  • Have thick and more muscular walls.
  • Carry oxygenated blood (except pulmonary artery which carries deoxygenated blood).
  • The blood flows with j erks and under great force.
  • Carry blood towards the heart.
  • Have thin and less muscular walls.
  • Carry deoxygenated blood (except pulmonary vein which carries oxygenated blood).
  • The blood flows smoothly and under little pressure.

Capillaries :

  • Arteries after entering an organ divide into number of smaller branches called arterioles which further divide repeatedly to form a network of fine branches called capillaries.
  • The walls of the capillaries are very thin and are one cell deep.
  • The Capillaries after the metabolic exchange unite to form larger vessels called venules, which again unite to form a vein.

PQ. During surgical operations or during accidents, the patient may be given blood from outside to save his life. What is the technical name of this process ? Briefly explain the precautions to be taken in this process. Answer: During surgical operation or an accident when excess of bleeding takes place, the patient may be given blood from outside to save his life. The transfer of blood from the donor to the recipient is called blood transfusion. The following precautions are taken before the blood is given to the needy person:

  • Matching of the donor’s blood with that of the recipient should be done.
  • It should be made sure clinically that blood of donor is free from any infection.
  • Sterilization of all the instruments to be used during the operation is must.

Question 2. State briefly, the difference between white blood cells and the red blood cells. Difference between white blood cells and the red blood cells Answer: RBC

  • They do not have nucleus atmaturity.
  • Life span is 120 days.
  • They are about 5 million/mm 3 of blood.
  • In the embryonic stage the RBC are formed in the liver and spleen. But after birth, they are formed in the red bone marrow.
  • WBC have a short life.span of 5 to 20 days.
  • They are about 7000/mm 3 of blood.
  • WBC are formed in the red bone marrow.

Question 3. You can see some blood vessels on the outside of the hands specially in older people. Are those veins or arteries ? How can you confirm your answer ? Answer: In older persons the skin becomes loose as the fat below becomes less with age and the vessels passing through these areas especially on the outside of the hands become prominent. These are veins as they flow superficially. The veins are thin and less muscular. These carry the blood to the heart veins are placed superficially so they are easily visible to the eye and are prominent. The blood in the veins will be carrying CO 2  and will have many substances like sugar, amino acids, chemicals and bacteria.

Selina Concise Biology Class 6 ICSE Solutions - The Circulatory System 2

  • Left pulmonary artery
  • superior vena cava
  • Left pulmonary vein
  • Right auricle
  • Left auricle
  • Left ventricle

(a) Deoxygentated blood. (b) Aortic arch (Aorta). (c) Right Atrium. (d) Left Atrium

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Worksheet to practice key concepts about the circulatory system.

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Circulatory System

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    1. Which of the following is NOT one of the three main components of the circulatory system? a. Heart b. Lungs c. Blood d. Blood vessels 2. More than half of your blood is made of a liquid called _____________________________. 3. Each type of blood cell has a different job.

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