PSLE - Respiratory and circulatory System

What is the function of the respiratory system?

• to allow for gaseous exchange

• to breathe in and breathe out air

• to transport substances around in the body

• to break down food into simpler substances.

Several people were trapped in a lift for 40 minutes. There is no fresh air entering the lift.

Which of the following shows what happened in the lift after 40 minutes?

• oxygen - decreased

• carbon dioxide - increased

• water vapour - decreased

• nitrogen - no change

State substances carry by blood in A. (You may choose more than 1)

• oxygen

• carbon dioxide

• food

• water

Which two blood vessels carry blood with more oxygen?

• A and B

• B and C

• A and D

• C and D

What are the organs in a human circulatory system? (You may choose more than 1 option)

• heart

• lungs

• blood

• blood vessels

• small intestine

Which of the following about the function of heart is correct?

• The heart transport oxygen to all body parts.

• The heart removes carbon dioxide from the body.

• The heart pumps blood containing substances around the body parts.

• The heart takes in oxygen from the surrounding into the body.

What is the function of the human circulatory system?

• It pump blood around the body parts.

• It transport substances around the body parts.

• It take in oxygen and remove carbon dioxide from the body.

• It pump blood.

What are the organs in a human respiratory system? (You may choose more than 1 option)

• windpipe

• lungs

• gullet

• heart

• mouth / nose

Study the diagram. Which two arrows were not drawn correctly.

• A and D only

• B and C only

• E and F only

• G and H only

Which of the following statements is correct?

• A has more oxygen than B.

• A has more oxygen than C.

• B has more oxygen than D.

• D has more oxygen than C