Question

Determine fluid movement when hydrostatic pressure exceeds colloid osmotic pressure at the arteriolar ends of the capillary.

a. water is pushed into the capillary by absorption
b. water is pushed off the capillary by filtration
c. there is no net movement of water
d. water is pulled into the capillary by absorption

Answer 1

When the hydrostatic pressure is higher than the colloid osmotic pressure at the arteriolar end of a capillary, water is pushed out of the capillary into surrounding tissues by filtration.

Step-by-step explanation:

When the hydrostatic pressure exceeds the colloid osmotic pressure at the arteriolar ends of the capillary, water is pushed out of the capillary by filtration.

This is due to the hydrostatic pressure being the force exerted by a fluid against a surface, and in this case, it pushes fluid from the arterial end of the blood vessel into the surrounding tissues.

This is opposed by the colloid osmotic pressure, often called oncotic pressure, which is determined by proteins in the blood and tends to draw water back into the capillary. However, in the arteriolar end where the hydrostatic pressure is greater, the net movement results in filtration rather than absorption.