Why Is the Velocity of Blood Flow the Lowest in Capillaries

question 3

Multiple Choice

Why is the velocity of blood flow the lowest in capillaries?

• A)The capillary walls are not thin enough to allow oxygen to exchange with the cells.
• B)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 surface area of the capillaries is larger than the total surface area of the arterioles.

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