Transport in Humans [GCE O Level]

Arteries, except for the pulmonary artery, carry

• deoxygenated blood away from the heart under high pressure

• deoxygenated blood away from the heart under low pressure

• oxygenated blood away from the heart under high pressure

• oxygenated blood away from the heart under low pressure

The diagram shows a section through the human heart.

What happens as blood pumped out of the heart?

• semi lunar valves:close

  blood passes to the lungs through vessel: 1

• semi lunar valves:close

  blood passes to the lungs through vessel: 2

• semi lunar valves:open

  blood passes to the lungs through vessel: 1

• semi lunar valves:open

  blood passes to the lungs through vessel: 2

Which statements about veins is correct?

• They have thick walls with valves.

• They have thick walls without valves.

• They have thin walls with valves.

• They have thin walls without valves.

The diagram shows a component found in blood.

What is the function of this component?

• To kill bacteria.

• To transport oxygen.

• To transport carbon dioxide.

• To clot blood during injuries.

The diagram shows the front view of a human heart.

Letters P, Q, R and S indicate the different chambers of the heart.

Which of the following shows the sequence in which a blood cell returning from other parts of the body passes through the four chambers of the heart?

• R-S-P-Q

• Q-S-R-P

• P-R-Q-S

• S-R-P-Q

The bar chart shows the concentration of oxygen in blood sampled at four places in the circulatory system of a human.

Which blood sample was taken from the pulmonary vein?

• A

• B

• C

• D

The diagram shows part of the human circulatory system.

In which blood vessel is the blood pressure highest?

• A

• B

• C

• D

The diagram below shows the pressure changes in the left side of the heart.

At which point does the bicuspid valve closes?

• A

• B

• C

• D

What causes the sounds of a heartbeat?

• The backflow of blood hitting the heart muscles.

• The closure of the semi-lunar valves, bicuspid valve and tricuspid valve.

• The flow of blood into the left and right atria.

• The return of blood into the heart from the vena cava and pulmonary vein.

The graph below shows the changes in blood oxygen content and blood pressure along blood vessels (1), (2) and (3).

Which of the following best represents the identities of blood vessels (1), (2) and (3)?

• blood vessel 1: aorta

  blood vessel 2: capillary

  blood vessel 3: pulmonary vein

• blood vessel 1: pulmonary artery

  blood vessel 2: capillary

  blood vessel 3: pulmonary vein

• blood vessel 1: pulmonary vein

  blood vessel 2: pulmonary artery

  blood vessel 3: capillary

• blood vessel 1: pulmonary vein

  blood vessel 2: aorta

  blood vessel 3: capillary