The capillary filtration pressure (arterial end of the capillary) is 30 mm Hg and 7 mm Hg at the venous end.The capillary oncotic pressure is 15 mm Hg.Which of the following is true?
A)Most water is filtered out of the capillary into the interstitium at the arterial end of the capillary.
B)The capillary oncotic pressure is responsible for the movement of water from the capillary into the interstitium.
C)The capillary oncotic pressure is responsible for the flow of blood from the arterial end of the capillary to the venous end of the capillary.
D)A decline in capillary oncotic pressure causes excess water to be reabsorbed from the interstitium.

Question

Quizplus · Accepted Answer

The capillary filtration pressure (arterial end of the capillary) is higher than the venous end, which means there is a net movement of water from the capillary into the interstitium. This is because the hydrostatic pressure at the arterial end (30 mm Hg) is greater than the capillary oncotic pressure (15 mm Hg), whereas at the venous end, the hydrostatic pressure (7 mm Hg) is lower than the capillary oncotic pressure, leading to reabsorption of excess water from the interstitium back into the capillary. Therefore, most water is filtered out of the capillary into the interstitium at the arterial end of the capillary.

The Capillary Filtration Pressure (Arterial End of the Capillary) Is