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Science Quiz - Circulatory System 01 (Questions)

The circulatory system moves blood around the body. In KS3 Science, pupils study the heart, blood vessels, and how oxygen and nutrients are delivered to every cell.

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Fascinating Fact:

Red blood cells carry oxygen using a protein called haemoglobin.

In KS3 Science, you will learn about the circulatory system, including how the heart pumps blood, how vessels transport it, and how blood cells support life processes.

Key Terms

Heart: A muscular organ that pumps blood around the body.
Arteries: Blood vessels that carry blood away from the heart under high pressure.
Veins: Blood vessels that return blood to the heart, often with valves to stop backflow.

Frequently Asked Questions (Click to see answers)

What is the circulatory system in KS3 Science?

The circulatory system is the body’s transport system. It includes the heart, blood, and vessels that move oxygen, nutrients, and waste around the body.

How does the heart pump blood?

The heart pumps blood by contracting its chambers in a rhythmic cycle, sending oxygen-rich blood to the body and returning deoxygenated blood to the lungs.

Why are red blood cells important?

Red blood cells are important because they carry oxygen from the lungs to the body using haemoglobin, and they remove carbon dioxide for exhalation.

Try These Related Quizzes

1.

Which of the following is not part of the circulatory system?

[ ]	Arteries
[ ]	Capillaries
[ ]	Lungs
[ ]	Veins

2.

Which of the following is not a function of the arteries?

[ ]	To carry blood away from the heart
[ ]	To carry blood into the heart
[ ]	To supply food to the cells
[ ]	To supply oxygen to the cells

3.

Which of the following is not a function of the veins?

[ ]	To carry blood away from the heart
[ ]	To carry blood into the heart
[ ]	To carry carbon dioxide away from the cells
[ ]	To carry waste away from the cells

4.

Which of the following statements about arteries is NOT true?

[ ]	Substances can pass through their walls
[ ]	They carry blood away from the heart
[ ]	They have a thick wall containing muscle
[ ]	They have no valves

5.

Which of the following, about veins, is NOT true?

[ ]	Substances cannot pass through their walls
[ ]	They carry blood to the heart
[ ]	They have no valves
[ ]	They have thin walls

6.

Which of the following, about capillaries, is NOT true?

[ ]	Substance exchange in cells and blood takes place here
[ ]	They are too small to see without a microscope
[ ]	They connect arteries to veins
[ ]	They have thick walls

7.

Which of the following is not a component of blood?

[ ]	Plasma
[ ]	Plates
[ ]	Red blood cells
[ ]	White blood cells

8.

The main organ in the circulatory system is the .......

[ ]	brain
[ ]	heart
[ ]	liver
[ ]	lungs

9.

Most of the veins in your body carry:

[ ]	deoxygenated blood
[ ]	reoxygenated blood
[ ]	pure oxygen
[ ]	oxygenated blood

10.

Which of the following is not true about the ventricles of the heart?

[ ]	They are the lower chambers of the heart
[ ]	They are the upper chambers of the heart
[ ]	They have more muscle than the atria
[ ]	They pump blood

You can find more about this topic by visiting BBC Bitesize - The circulatory system

Science Quiz - Circulatory System 01 (Answers)

1.

Which of the following is not part of the circulatory system?

[ ]	Arteries
[ ]	Capillaries
[x]	Lungs
[ ]	Veins

The lungs are part of the respiratory system. The circulatory system is concerned with transporting the blood round the body. The lungs do not help to transport blood round the body, only the heart and blood vessels do that, the lungs simply allow gases to be exchanged between the air and our blood

2.

Which of the following is not a function of the arteries?

[ ]	To carry blood away from the heart
[x]	To carry blood into the heart
[ ]	To supply food to the cells
[ ]	To supply oxygen to the cells

The main artery in the body is called the aorta

3.

Which of the following is not a function of the veins?

[x]	To carry blood away from the heart
[ ]	To carry blood into the heart
[ ]	To carry carbon dioxide away from the cells
[ ]	To carry waste away from the cells

When a doctor or nurse takes a blood sample from a patient, they take it from a vein

4.

Which of the following statements about arteries is NOT true?

[x]	Substances can pass through their walls
[ ]	They carry blood away from the heart
[ ]	They have a thick wall containing muscle
[ ]	They have no valves

No substances can pass through the artery wall

5.

Which of the following, about veins, is NOT true?

[ ]	Substances cannot pass through their walls
[ ]	They carry blood to the heart
[x]	They have no valves
[ ]	They have thin walls

They have valves to prevent the blood from flowing back down the vein. If it did, all of your blood would end up in your feet or fingers!

6.

Which of the following, about capillaries, is NOT true?

[ ]	Substance exchange in cells and blood takes place here
[ ]	They are too small to see without a microscope
[ ]	They connect arteries to veins
[x]	They have thick walls

Their walls are only one cell thick

7.

Which of the following is not a component of blood?

[ ]	Plasma
[x]	Plates
[ ]	Red blood cells
[ ]	White blood cells

Should be platelets, these are cells that help your blood to form a clot when a blood vessel is damaged

8.

The main organ in the circulatory system is the .......

[ ]	brain
[x]	heart
[ ]	liver
[ ]	lungs

Heart muscle does not get tired which is just as well as you need it to work all day and every day of your life

9.

Most of the veins in your body carry:

[x]	deoxygenated blood
[ ]	reoxygenated blood
[ ]	pure oxygen
[ ]	oxygenated blood

Most of the oxygen carried by the blood cells is passed to the cells of the body through the walls of capillaries by the time your blood reaches a vein

10.

Which of the following is not true about the ventricles of the heart?

[ ]	They are the lower chambers of the heart
[x]	They are the upper chambers of the heart
[ ]	They have more muscle than the atria
[ ]	They pump blood

Blood enters the ventricles from the atria