Cell Membranes

Definition

The cell membrane is a thin, flexible barrier that surrounds all cells and regulates what enters and leaves the cell.

Related terms

Semi-permeable: This term describes membranes that allow some substances to pass through while blocking others.

Transport Proteins:

These are proteins embedded in the cell membrane that help move substances across it.

Endocytosis/Exocytosis: These processes involve the transport of large molecules across the cell membrane; endocytosis brings substances into the cell, while exocytosis expels them.