What Separates the Intracellular Fluid from the Extracellular Fluid

Question

What separates the intracellular fluid from the extracellular fluid?
A) nucleus
B) cytoskeleton
C) plasma membrane
D) mitochondrion

Accepted Answer

The plasma membrane separates the intracellular fluid (fluid inside the cell) from the extracellular fluid (fluid outside the cell). The membrane is selectively permeable, allowing certain substances to pass through while preventing others from crossing the barrier.