As blood travels from arteries to veins,
a) diameter of the blood vessels gets progressively smaller.
b) pressure builds.
c) pressure drops.
d) flow becomes turbulent.
e) viscosity increases.

The correct answer will be option-C.

Explanation:

Blood pressure is the amount of force blood exerts against the walls of the vessel as it moves through it.

Blood always flows from high pressure to low pressure, in arteries the blood pressure is very high but as blood reaches the capillaries and finally the veins the pressure drops.

The reduced pressure during blood flow in veins as the flow is not under control of ventricular contraction but it depends on the constriction of the smooth muscle, skeletal muscle action and the respiratory movement.

Thus, Option-C is the correct answer.

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