1. The Plasma Membrane

2. Plasma Membrane
Flexible boundary of a cell that separates a cell from its surroundings.

3. Plasma Membrane
Regulates what enters and leaves the cell and also provides protection and support.
This is called selective permeability.

4. Selective Permeability
Some molecules are allowed to pass through plasma membrane at anytime.
Other molecules are only allowed at certain times or in limited amounts.
Some molecules are never allowed.

5. Structure of Plasma Membrane
Phospholipid bilayer
Double-layered sheet that makes up nearly all plasma membranes.
Phospholipid
Made up of glycerol, two fatty acids, and a phosphate group.

6. Structure of Plasma Membrane

7. Structure of Plasma Membrane
Plasma membrane contains:
Protein molecules that are embedded in the phospholipid bilayer
Carbohydrate molecules are attached to many of the proteins
The organization of all these structures is called the fluid mosaic model.