The Velocity of Blood Flow Is the Lowest in Capillaries

question 33

Multiple Choice

The velocity of blood flow is the lowest in capillaries because

• A) the capillary walls are not thin enough to allow oxygen to exchange with the cells.
• B) the capillaries are far from the heart, and blood flow slows as distance from the heart increases.
• C) the diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate.
• D) the systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle.
• E) the total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system.

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