Question

question 47
1.67 pts
the velocity of blood flow through capillaries is
o rapid, due to their small total cross sectional area.
o slow, which allows sufficient time for exchange of gases and nutrients between blood and tissues.
o rapid, which prevents pooling in lower extremeties.
o slow, due to small total cross - sectional area, low friction and high pressure.

Explanation:

Capillaries have a large total cross - sectional area. Blood flow velocity is inversely proportional to the total cross - sectional area of the vessels. Slow blood flow in capillaries allows for efficient gas and nutrient exchange between blood and tissues.

Answer:

B. slow, which allows sufficient time for exchange of gases and nutrients between blood and tissues.