At the venous end of a normal capillary, which force mainly draws fluid back into the capillary?
Correct answer: B. Plasma colloid osmotic pressure
- A. Capillary hydrostatic pressure
- B. Plasma colloid osmotic pressure
- C. Interstitial hydrostatic pressure
- D. Lymphatic valve pressure
Explanation
Plasma proteins, especially albumin, create colloid osmotic pressure that draws water into the capillary at the venous end. Capillary hydrostatic pressure tends to push fluid outward, while lymphatics remove excess interstitial fluid.
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