Kaplan FL #3 PS Question #2

[LaCasta]

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If anyone could explain to me why the fluid is flowing out of the gut if you decrease arterial pressure, and what they mean by the hydrostatic pressure being lower in the capillary bed than the osmotic pressure, I would really appreciate it.

 

[TieuBachHo]

A decrease in arterial pressure will cause a decrease in hydrostatic pressure, right? If the hydrostatic pressure is lower than the osmotic pressure, the fluid would flow out of the gut (and into the capillaries). This results in the weight loss of the gut. Hence, in order to increase its weight, we need to increase the hydrostatic pressure so that the fluid can flow out of the capillaries and into the gut. Make sense? That's what they meant by venus pressure should be increased so the fluid can't flow back in from the gut. The gut will, therefore, maintain its weight.

Hydrostatic pressure causes fluid to flow out of capillaries and osmotic pressure causes fluid to flow back in.

 

[LaCasta]

A decrease in arterial pressure will cause a decrease in hydrostatic pressure, right? If the hydrostatic pressure is lower than the osmotic pressure, the fluid would flow out of the gut (and into the capillaries). This results in the weight loss of the gut. Hence, in order to increase its weight, we need to increase the hydrostatic pressure so that the fluid can flow out of the capillaries and into the gut. Make sense? That's what they meant by venus pressure should be increased so the fluid can't flow back in from the gut. The gut will, therefore, maintain its weight.

Hydrostatic pressure causes fluid to flow out of capillaries and osmotic pressure causes fluid to flow back in.

Thanks

That makes more sense