Q. 274.4( 40 Votes )

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Answer :

(i) The pulmonary artery (labelled as C) carries deoxygenated blood to the lungs and the pulmonary veins (labelled as F) carry oxygenated blood from lungs back to the heart.

(ii) The process of double circulation is as follows:

a) The deoxygenated blood pumped by the right ventricle enters the pulmonary artery and the oxygenated blood is pumped into the aorta by the left ventricle.

b) The deoxygenated blood pumped into the pulmonary artery is then carried on to the lungs from where the oxygenated blood is then carried by the pulmonary veins to the left atrium.

This is known as Pulmonary circulation.

c) The oxygenated blood is carried by arteries, arterioles and capillaries to the tissues and from these tissues, deoxygenated blood is collected veins and vena cava and passed into the right atrium.

This is known as the Systemic circulation.

The blood goes through the heart twice during each cycle and this is known as double circulation.

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