VASCULAR
CAPILLARIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hydrostatic pressure forces it out of the arterial end of the capillary
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Hydrostatic pressure forces it out of the venous end of the capillary
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High water potential in the capillary relative to tissues causes osmosis
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Low water potential in the capillary relative to tissues causes osmosis
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Detailed explanation-1: -CHP is the force that drives fluid out of capillaries and into the tissues. As fluid exits a capillary and moves into tissues, the hydrostatic pressure in the interstitial fluid correspondingly rises.
Detailed explanation-2: -Fluid is forced out of systemic capillaries at the arteriolar end because: The blood pressure is less than that of the interstitial fluid. The osmotic pressure of the interstitial fluid is greater than that of the blood.
Detailed explanation-3: -The high pressure of arteriole blood causes pressure filtration. Pressure filtration causes plasma to pass through the thin capillary walls into the tissue fluid surrounding the cells.
Detailed explanation-4: -The hydrostatic pressure is 32 mmHg at the arterial end of capillary (Phc, a) and 15 mmHg at the venous end (Phc, b). Because of the gradient of the hydrostatic pressure along the capillary, filtration usually occurs at the arterial end of the capillary and reabsorption at its venous end.