What best describes an aspect of the movement of fluid and solutes between the capillaries and the interstitial space?
a. At the tissue level, osmotic pressure tends to draw water into the interstitial space.
b. Electrolytes move freely across the capil-lary wall into the interstitium.
c. The capillary and interstitial hydrostatic pressures are approximately equal.
d. The interstitial fluid has a relatively high protein concentration.
ANS: B
The first stage of homeostasis is fluid exchange between systemic capillaries and interstitial fluid by passive diffusion. Capillary walls are permeable to crystalline electrolytes. This allows equilib-rium between the two extracellular compartments to occur quickly.
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