Structure & Function

What are the parts of the human circulatory system? Choose the correct statement.

• heart, blood and blood vessels

• heart, blood and trachea

• lungs, blood and blood vessels

What are the parts of the human respiratory system? Choose the correct statement.

• nose, windpipe and lungs

• windpipe, heart and lungs

• nose, lungs, and blood vessels

The ...................... carry blood rich in oxygen away from the heart.

• arteries

• veins

• capillaries

Air passes through our trachea into our ...

• lungs

• heart

• blood vessels

• arteries

Answer explanation

The ...................... carry blood poor in oxygen towards the heart.

• arteries

• veins

• capillaries

The diaphragm is a thin sheet muscle below our lungs that helps us breathe.

Look at the pictures.

Diagram B shows the process of ........................................

• breathing in

• breathing out

The diaphragm is a thin sheet muscle below our lungs that helps us breathe.

Look at the pictures.

Diagram A shows the amount of air in the lungs is ........................................

• more

• less

The diaphragm is a thin sheet muscle below our lungs that helps us breathe.

Look at the pictures.

Diagram B shows the amount of air in the lungs is ........................................

• more

• less

The diagram shows the human respiratory system.

Each part of the respiratory system has a different function.

Part ...................... is covered with many blood vessels for gas exchange to take place.

• Part A

• Part B

• Part C

Blood flows through three types of blood vessels.

.................................... allow substances to move into and out of blood.

• arteries

• veins

• capillaries