What is the net effect of the hydrostatic pressure gradient between the capillary and interstitial space?
a. It tends to push water into the capillaries.
b. It tends to push water into the interstitial spaces.
c. The pressure gradient is zero so fluid movement is due to osmosis.
d. It tends to push water into the cells.
ANS: B
Movement of fluid and solutes from capillary blood to interstitial spaces is enhanced by the dif-ference in hydrostatic pressure between compartments. Hydrostatic pressure difference depends on blood pressure, blood volume, and the vertical distance of the capillary from the heart (i.e., the effects of gravity). Hydrostatic pressure tends to cause fluid to leak out of capillaries into the in-terstitial spaces.
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