|(i)||They are thin walled vessels with a small lumen,||They are thick walled vessels with narrow lumen,||They are thin walled vessels with wide lumen.|
|(ii)||They deliver blood to the body cells.||They carry blood away from the heart.||They bring blood towards the heart.|
|(iii)||They are placed very deep.||They are situated in the deeper regions of the body.||They are superficially situated.|
|(iv)||They carry both oxygenated and deoxygenated blood||They carry oxygenated blood, except one.||They carry deoxygenated blood, except one.|
A) X is permeable to gases and other substances while Y and Z are impermeable.
B) X and Y are permeable to gases and other substances while Z is impermeable.
C) X and Z are permeable to gases and other substances while Y is impermeable.
D) Y is permeable to gases and other substances while X and Z are impermeable.
Correct Answer: A
Solution :According to the given differences, X, Y and Z refer to capillaries, arteries and veins respectively. Capillaries are permeable to gases and other substances while arteries and veins are impermeable to gases and other substances.
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