31. The fluid under a blister or the lymph that bathes the interstitial spaces between organs is very watery compared with the viscosity of blood plasma. Why?
(A) The viscosity of blood is completely due to blood cells that never leave the vessels.
(B) These fluids are primarily water produced by cell respiration, and they are discarded interstitially.
(C) The capillaries use active transport to retrieve large molecules that leaked away.
(D) Large molecules, such as plasma albumin, rarely cross the capillary wall.
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