Hydrostatic & Osmotic Pressure

Hydrostatic & Osmotic Pressure

Water and small proteins leak out of capillaries at their arterial ends because hydrostatic pressure (exerted mainly by blood pressure pushing outward against the capillary walls) is greater than colloid osmotic pressure (a fluid-retaining force caused by large solutes in the blood). Most of the fluid returns at the venule end because blood pressure:

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Photo attributed to Wwarby.

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