Question

large proteins such as albumin remain in capillaries rather than diffusing out, resulting in the a. loss of osmotic pressure in the capillaries. b. development of an osmotic pressure difference across capillary walls. c. loss of fluid from capillaries at the venous end d. increased diffusion of co2. e. increased diffusion of hb.

Answer 1

Large proteins such as albumin remaining in capillaries create an osmotic pressure difference across the capillary walls, leading to reabsorption of water. This difference in colloidal osmotic pressure enables water to be drawn from the tissue fluid back into the capillary, carrying dissolved molecules with it.

Step-by-step explanation:

Large proteins such as albumin remain in capillaries rather than diffusing out, resulting in the development of an osmotic pressure difference across capillary walls. The pressure created by the concentration of colloidal proteins in the blood is called the blood colloidal osmotic pressure (BCOP).

This BCOP is higher than the interstitial fluid colloidal osmotic pressure (IFCOP), which is always very low because interstitial fluid contains few proteins. Thus, water is drawn from the tissue fluid back into the capillary, carrying dissolved molecules with it. This difference in colloidal osmotic pressure accounts for reabsorption.