Which statement about the plasma membrane is not true?
A) It serves as a mechanical barrier to hold in the contents of the cell.
B) It selectively controls movement of molecules between the ECF and the ICF.
C) It is the barrier that surrounds the blood vessels and separates the blood plasma from the interstitial fluid.
D) It contains proteins that provide membrane functions.
E) It has cholesterol to maintain rigidity.

Question

Quizplus · Accepted Answer

The plasma membrane is the barrier that surrounds individual cells and separates the inside of the cell (intracellular fluid or ICF) from the outside environment (extracellular fluid or ECF). It is not the barrier that surrounds blood vessels and separates the blood plasma from the interstitial fluid. This is the function of the endothelial cells that line blood vessel walls.

Which Statement About the Plasma Membrane Is Not True