1. which of the following describes a vein?
a. It has thin walls and carries oxygenated blood away from the heart.
b.It has a very thick walls with valves and carries blood under pressure
c. It has a very thin wall with valves and carries blood under pressure
d.It has thin walls with valves, and carries blood to the heart.
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(b) The 'veins carry blood from other parts' of the body to the arteries the organs does not pump the blood and hence the pressure is lower and therefore the veins are thin walled. (c) The valves in the veins are thin because they handle very less pressure of blood that flows from different organs to the heart.
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