Cell Membrane - Structure & Function

Surface membranes are called plasma membranes: control what enters by diffusion/osmosis/active transport. Recognition by other cells. Cell communication.

Membranes within cells divide the cell into different compartments for example enzymes for respiration are kept together inside mitochondria. Membranes inside organelles are folded many times to increase surface area to increase the number of enzymes for example cristae in mitcohondria. Can form vesicles for transport. Control what enters and leaves the organelle for example 'R' 'N' 'A' leaves the nucleus via the nuclear membrane.

The fluid mosaic model describes the structure of the plasma membrane, it is partially permeable. Phospholipid molecules form a continuous bilayer. Constantly…