Why do veins have thin walls as compared...

Why do veins have thin walls as compared to arteries ?

Text Solution

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Arteries are thick walled blood vessels which carry blood from heart to all parts of body. They have thick walls bacause blood emerges from the heart under high pressure.
In comparison , veins are thin walled blood vessels which carry deoxygenated blood from all parts of the body back to the heart. They do not need thick walls because blood flowing through them is no longer under high pressure. Instead ,they valves which prevent the backflow of blood

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Assertion (A) : Veins have thinner walls compared to arteries. Reason (R) : Veins carry deoxygenated blood.

Both (A) and (R) are true and (R) is correct explanation of the assertion.

Both (A) and (R) are true but (R) is not the correct explanation of the assertion.

(A) is true but (R) is false.

(A) is false bu (R) is true.

As compared to artery, a vein has

(l)thinner walls

(2)larger lumen

(3) less musculature.

(4) all of the above

Which of the following statements are true about veins in human circulatory system? A. All veins carry carbon dioxide-rich blood. B. Veins have thin walls. C. Veins carry blood from different organs to heart.

A, B and C

A and B

B and C

A and C