Question

Draw a sectional view of the human heart and label on it the
following parts:
i) Aorta
ii) Pulmonary arteries
iii) Vena cava from upper body
iv) Left ventricle
b) Why is double circulation of blood necessary in human beings?

Answer 1

Answer:

THIS IS THE ANSWER FOR A

FOR B -

This double circulatory system is important because it ensures provision of oxygenated blood to the muscle and not a mixture of oxygenated and de-oxygenated blood. Hence, this system ensures efficient supply of oxygenated blood to the muscles.

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Answer 2

Answer:

b) That's because the deoxygenated blood and oxygenated blood ought not to be mixed together.