Question

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.

Answer 1

Water and solutes leave capillaries at the arterial end because the net filtration pressure of the blood is higher at the arterial end than it is at the venous end.

Step-by-step explanation:

Capillaries are small blood vessels that allow for the exchange of fluids and solutes between the blood and the surrounding tissues. At the arterial end of the capillary, the net filtration pressure of the blood is higher than the net filtration pressure of the interstitial fluid. This means that there is a greater force pushing fluid out of the capillary into the tissues compared to the force pushing fluid back into the capillary. This difference in pressure allows water and solutes to leave the capillaries at the arterial end.

Answer 2

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

Step-by-step 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.