Give reasons for the following
a) The muscular walls of ventricles are thicker than the walls of atria b) Arteries have thick elastic walk. c) Veins have valves.
Answers
a)Their muscular walls are thicker than the atria because they have to pump blood out of the heart. ... This is because the left ventricle has to pump blood at a higher pressure so that it reaches all areas of the body (including the fingers and toes) but the right side only has to pump blood to the lungs.
b)The heart pumps blood at high pressure. If arteries have thin walls they would burst because of high blood pressure. That is why arteries have thick elastic walls.
c)Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.
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Answer:
a) the walls of ventricles are thicker than the walls of arteries because they have to pump blood to large distances that is up to the brain and to the foot against gravity .
a) the walls of ventricles are thicker than the walls of arteries because they have to pump blood to large distances that is up to the brain and to the foot against gravity .Explanation:
a) the walls of ventricles are thicker than the walls of arteries because they have to pump blood to large distances that is up to the brain and to the foot against gravity .Explanation:b) the pressure in the arteries is very much as compared to the veins it is because the because it is because the the carry the oxygenated blood by the heart forward and therefore they have thick muscular walls so that they are able to carry the blood with the high pressure
a) the walls of ventricles are thicker than the walls of arteries because they have to pump blood to large distances that is up to the brain and to the foot against gravity .Explanation:b) the pressure in the arteries is very much as compared to the veins it is because the because it is because the the carry the oxygenated blood by the heart forward and therefore they have thick muscular walls so that they are able to carry the blood with the high pressurec)veins have to prevent the backflow of the deoxygenated blood from the organs to the heart.
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