Q5 of 95 Page 94

Give reason for the following:

Atrial wall is less muscular than the ventricular wall.

The atrial walls are less muscular than the ventricular walls because atria pumps blood directly into the ventricles while ventricles pump blood to farthest points in the body like up to the toes in the feet or up to the brain. As they have to apply greater force & are hence provided with muscular walls.


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Give reason for the following:

The blood groups of both the donor and recipient must be known before transfusing blood.

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Only the veins and not the arteries are provided with valves.

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Give reason for the following:

The arteries are deep seated in the body.

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Given below are the diagrammatic sketches of two kinds of blood vessels.


(a) Identify the blood vessels A and B


(b) Name the parts numbered 1 to 6.


(c) Mention any two main differences between A and B.