Question

1.Give reasons for the following:
a. The muscular walls of ventricles are thicker than the walls of a
b. Arteries have thick elastic walls
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Answer 1

Answer:

muscular walls of ventricles are thicker than walls of atrium because ventricles are pumping chambers hence they must be flexible and they must exert more pressure on the oxyganated blood so that it reaches all parts of the body.

Arteries have thick walls because they must carry oxyganted blood and they must exert more pressure on the oxyganated blood so that arteries must transport oxyganated blood to all parts of the bodies.

Answer 2

A) Ventricles have thicker walls than auricles because they have to pump blood from heart to  body for circulation.

B) Arteries are the vessels which carry blood from heart to body and that blood had high pressure.

Explanation:

Ventricles are lower chambers of heart that contract from downward to upward position. They have to pump blood out of heart with high pressure so that it can easily circulate in body. If its wall would be thin they will not be able to generate that much pressure.

                  Arteries only carry oxygenated blood from heart to body. Now as heart is a pumping organ, It pushes blood with greater pressure . Thick and elastic walls of arteries favor its flow with such a high pressure otherwise if they would be thin and non elastic they might definitely got damaged due to inability to bear the pressure