The velocity of blood flow through capillaries is
A)rapid,due to their small total cross sectional area.
B)rapid,which prevents pooling in lower extremeties.
C)slow,due to small total cross-sectional area,low friction and high pressure.
D)slow,which allows sufficient time for exchange of gases and nutrients between blood and tissues.

Question

Quizplus · Accepted Answer

The velocity of blood flow through capillaries is slow, which allows sufficient time for exchange of gases and nutrients between blood and tissues. This slow flow ensures that there is adequate time for diffusion of nutrients, oxygen and carbon dioxide between blood and tissues, which is necessary for their exchange.

The Velocity of Blood Flow Through Capillaries Is