Semi-permeable Membrane

Definition

A semi-permeable membrane is a barrier that allows certain substances to pass through while restricting others based on their size or charge. It selectively permits the movement of specific molecules or ions across it.

Related terms

Permeability: The ability of a substance or material (like a membrane) to allow other substances or particles to pass through it.

Passive Transport:

The movement of molecules across membranes without requiring energy expenditure by the cell.

Active Transport:

The movement of molecules across membranes that requires energy expenditure by the cell.