Why do water and solutes leave capillaries at the arterial end?

A) the net filtration pressure of the blood is higher at the arterial end than it is at the venous end.
B) the net filtration pressure of the blood is higher at the venous end than it is at the arterial end.
C) the net filtration pressure of the interstitial fluid is higher at the arterial end than it is at the venous end.
D) the net filtration pressure of the interstitial fluid is higher at the venous end than it is at the arterial end.
E) the osmotic pressure is higher at the arterial end than it is at the venous end.

Question

hayleee4444 hayleee4444

17-05-2019
Biology

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Why do water and solutes leave capillaries at the arterial end?

A) the net filtration pressure of the blood is higher at the arterial end than it is at the venous end.
B) the net filtration pressure of the blood is higher at the venous end than it is at the arterial end.
C) the net filtration pressure of the interstitial fluid is higher at the arterial end than it is at the venous end.
D) the net filtration pressure of the interstitial fluid is higher at the venous end than it is at the arterial end.
E) the osmotic pressure is higher at the arterial end than it is at the venous end.

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BioWizard BioWizard · Answer 1 · 2019-05-27T10:59:24+02:00

Answer:

A) the net filtration pressure of the blood is higher at the arterial end than it is at the venous end.

Explanation:

Net filtration pressure is a pressure necessary for the movement of fluid out of the capillary. It depends on osmotic and hydrostatic pressures.

During the process of filtration (water from arterial end into the interstitial fluid), capillary hydrostatic pressure is higher than interstitial fluid hydrostatic pressure. This enables the movement of fluid.

Reabsorption is the opposite process (from the tissue fluid into the venous capillary) and it occurs because blood osmotic pressure is higher than the interstitial fluid osmotic pressure.

Net filtration pressure is negative during the rearbsorption.