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Science Quiz - The Human Circulatory System (Questions)

The circulatory system keeps our bodies alive by moving blood around. In KS2 Science, pupils learn how the heart, blood, and vessels work as one powerful system.

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Fascinating Fact:

White blood cells fight germs and can change shape to squeeze through walls of blood vessels.

In KS2 Science, pupils explore the circulatory system, which includes the heart, blood, and blood vessels. This system transports oxygen, food, and waste, keeping every cell in the body healthy.

Key Terms

Heart: A muscular organ that pumps blood around the body.
Arteries: Blood vessels that carry blood away from the heart.
Veins: Blood vessels that carry blood back to the heart.

Frequently Asked Questions (Click to see answers)

What is the circulatory system in KS2 Science?

The circulatory system is the body’s way of moving blood around. It includes the heart, blood, and vessels, which carry oxygen and nutrients to every part of the body.

How does the heart pump blood?

The heart contracts and relaxes in a regular rhythm, pumping blood through arteries to the body and bringing it back through veins for more oxygen.

What are white blood cells?

White blood cells are part of the blood. They defend the body from germs and can change shape to attack and destroy harmful invaders.

Try These Related Quizzes

1.

The human circulatory system includes the heart, lungs and blood vessels. What is another name for the circulatory system ?

[ ]	The endocrine system
[ ]	The cardiovascular system
[ ]	The nervous system
[ ]	The digestive system

2.

The heart pumps blood to the lungs. What waste product is removed from the blood by the lungs?

[ ]	Oxygen
[ ]	Acid
[ ]	Carbon dioxide
[ ]	Urea

3.

What enters the blood from the lungs?

[ ]	Oxygen
[ ]	Acid
[ ]	Carbon dioxide
[ ]	Urea

4.

Where does the heart pump oxygenated blood to?

[ ]	To the brain only
[ ]	To the lungs only
[ ]	To the digestive system only
[ ]	To the whole body

5.

Blood delivers oxygen and what else to the cells in your body?

[ ]	Carbon dioxide
[ ]	Energy
[ ]	Essential nutrients
[ ]	Kind thoughts

6.

Which one of the following is not part of the heart?

[ ]	Right ventilator
[ ]	Septum
[ ]	Right atrium
[ ]	Left ventricle

7.

Waste products must be removed before the blood returns to the heart. Which organs remove waste from the blood?

[ ]	The brain and spleen
[ ]	The liver and kidneys
[ ]	The skin and gall bladder
[ ]	The liver and spleen

8.

Which blood vessels carry oxygenated blood?

[ ]	Arteries
[ ]	Veins
[ ]	Capillaries
[ ]	All of the above

9.

Which are the thinnest and smallest blood vessels?

[ ]	Arteries
[ ]	Veins
[ ]	Capillaries
[ ]	None of the above

10.

What is the easiest way to measure your heart rate?

[ ]	By seeing how many sit-ups you can do in 30 seconds
[ ]	By counting your breaths
[ ]	By listening to your heartbeats
[ ]	By checking your pulse rate

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

Science Quiz - The Human Circulatory System (Answers)

1.

The human circulatory system includes the heart, lungs and blood vessels. What is another name for the circulatory system ?

[ ]	The endocrine system
[x]	The cardiovascular system
[ ]	The nervous system
[ ]	The digestive system

'Cardio' means 'heart' and 'vascular' refers to the blood vessels

2.

The heart pumps blood to the lungs. What waste product is removed from the blood by the lungs?

[ ]	Oxygen
[ ]	Acid
[x]	Carbon dioxide
[ ]	Urea

Carbon dioxide is sometimes written as CO₂

3.

What enters the blood from the lungs?

[x]	Oxygen
[ ]	Acid
[ ]	Carbon dioxide
[ ]	Urea

Carbon dioxide leaves the body and oxygen enters

4.

Where does the heart pump oxygenated blood to?

[ ]	To the brain only
[ ]	To the lungs only
[ ]	To the digestive system only
[x]	To the whole body

All the living cells in our bodies need oxygen in order to work

5.

Blood delivers oxygen and what else to the cells in your body?

[ ]	Carbon dioxide
[ ]	Energy
[x]	Essential nutrients
[ ]	Kind thoughts

Blood then takes on the waste materials from the cells, including carbon dioxide - it is a highly-efficient delivery system!

6.

Which one of the following is not part of the heart?

[x]	Right ventilator
[ ]	Septum
[ ]	Right atrium
[ ]	Left ventricle

Your heart is divided by the septum into two sides - each side is divided into an atrium and ventricle

7.

Waste products must be removed before the blood returns to the heart. Which organs remove waste from the blood?

[ ]	The brain and spleen
[x]	The liver and kidneys
[ ]	The skin and gall bladder
[ ]	The liver and spleen

The waste is passed out of the body when you go to the toilet

8.

Which blood vessels carry oxygenated blood?

[x]	Arteries
[ ]	Veins
[ ]	Capillaries
[ ]	All of the above

Veins carry deoxygenated blood back to the heart

9.

Which are the thinnest and smallest blood vessels?

[ ]	Arteries
[ ]	Veins
[x]	Capillaries
[ ]	None of the above

The walls of capillaries are only one cell thick!

10.

What is the easiest way to measure your heart rate?

[ ]	By seeing how many sit-ups you can do in 30 seconds
[ ]	By counting your breaths
[ ]	By listening to your heartbeats
[x]	By checking your pulse rate

Your pulse rate rises after you've been active for a short time