A nurse is discussing the movement of fluid across the arterial end of capillary membranes into the interstitial fluid surrounding the capillary. Which process of fluid movement is the nurse de-scribing?
a. Hydrostatic pressure
b. Osmosis
c. Diffusion
d. Active transport
ANS: A
Blood reaching the capillary bed has a hydrostatic pressure of 25–30 mm Hg, which is sufficient force to push water across the thin capillary membranes into the interstitial space. Osmosis in-volves the movement of fluid from an area of higher concentration to an area of lower concentra-tion. It does not involve pressure or force. Diffusion is the passive movement of a solute from an area of higher solute concentration to an area of lower solute concentration. Active transport in-volves movement up a concentration gradient.
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