What is the Barrier Between Plasma and Interstitial Fluid

Question

What is the barrier between plasma and interstitial fluid
A)blood vessel wall
B)plasma membrane
C)pleural membrane
D)transcellular membrane

Accepted Answer

The barrier between plasma and interstitial fluid is the blood vessel wall, specifically the capillary wall. The capillary wall is selectively permeable, allowing for the diffusion of small molecules such as oxygen and carbon dioxide, but preventing the passage of larger molecules such as proteins. This barrier helps maintain the balance of fluids and electrolytes between the plasma and interstitial fluid.