Plasma membrane

Functions of plasma membrane

cover and protect cell, control what comes in and out, links to other cells, and tells other cells “who” it is

Phospholipids

form lipid bilayer

Transmembrane proteins

most important protein and span entire lipid layer

Integral proteins

extend into or through bilayer

Peripheral proteins

attach to inner or outer surface but don’t extend through membrane

Glycoproteins

membrane proteins

Glycocalix

“sugary coating” surrounding membrane

Membrane proteins

ion channels, carriers, receptors, enzymes, linkers, and cell identity markers

Receptors

cellular recognition

Ligland

molecule that binds with a receptor

Selective permeability

allows some materials to pass while excluding others

What goes in cell membrane?

food, gases, nutrients

What goes out of cell membrane?

waste