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Please explain this to me.....

Student Assist   (654 Views | 1 Replies)

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I'm going over fluid movement in capillaries in my med surg book and there is a statement in the book that says, "Capillary hydrostatic pressure and interstitial oncotic pressure move water out of the capillaries". How can interstitial oncontic pressure move water out of the capillaries when the oncotic pressure is greater within the capillary? I'm confused. Please explain this to me. Thank you!

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Let's see if I can help. Capillaries have an arterial end and a venule end.

At the arterial end, hydrostatic pressure is higher than oncotic pressure so fluid moves in to the capillary. Whereas at the venule end, oncotic pressure is higher than hydrostatic so fluid moves out of the capillary.

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