The diagram shows the vertical section of a human heart.

Identify structure A.

• aorta

• pulmonary artery

• pulmonary vein

• vena cava

The diagram shows the vertical section of a human heart.

Identify structure C.

• aorta

• pulmonary artery

• pulmonary veins

• vena cava

The diagram shows the vertical section of a human heart.

Identify structure E.

• bicuspid valve

• heart tendon

• tricuspid valve

• semilunar valve

The diagram shows the vertical section of a human heart.

Identify structure F.

• bicuspid valve

• heart tendon

• tricuspid valve

• semilunar valve

The diagram shows the vertical section of a human heart.

Identify structure H.

• bicuspid valve

• heart tendon

• tricuspid valve

• semilunar valve

The diagram shows the vertical section of a human heart.

Identify structure K.

• aorta

• pulmonary artery

• pulmonary veins

• vena cava

The diagram shows the vertical section of a human heart.

Which structure(s) keep the blood flowing in one direction?

• E only

• H only

• E and L only

• E, H and L only

The diagram shows the vertical section of a human heart.

Which blood vessel carries deoxygenated blood under high pressure?

• A only

• B only

• C only

• K only

The diagram shows the vertical section of a human heart.

Which blood vessel first receives blood containing nicotine when a person is smoking?

• A

• B

• C

• K

The diagram shows the vertical section of a human heart.

Which structure separates the oxygenated blood from the deoxygenated blood?

• E

• F

• H

• Z