Question

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

Options

• The systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle.

• Capillaries are far from the heart, and blood flow slows as distance from the heart increases.

• The total surface area of the capillaries is larger than the total surface area of the arterioles.

• The capillary walls are not thin enough to allow oxygen to exchange with the cells.

• The diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate.

Answer 1

The total surface area of the capillaries is larger than the total surface area of the arterioles.