Question

Explain the role of the following parts of the human circulatory system in circulation of blood.
a) Pulmonary artery
b) Pulmonary vein
c) Left ventricle
d) Right atrium

Answer 1

a) Pulmonary artery: It carries the deoxygenated blood from the right ventricle to the lungs for oxygenation. [0.5 Mark]

b) Pulmonary vein: It carries back the oxygenated blood from the lungs into the left atrium of the heart. [0.5 Mark]

c) Left ventricle: It pumps out the oxygenated blood into the aorta for transfer to the entire body. [0.5 Mark]

d) Right atrium: It receives the deoxygenated blood from the entire body through the superior and inferior vena cava. [0.5 Mark]