1. Cell Membrane

2. Plasma or Cell Membrane: Function:
1. Outer boundary of the cell
-separates one cell from another

3. 2. Allows for interaction between like cells within
a tissue.

4. -regulates what is allowed to enter or leave the cell.
3. Acts as a “gatekeeper”
-regulates what is allowed to enter or leave the cell.
Aids in protection and support.
-keeps out bacteria
-provides some shape
Oxygen
Food Molecules
Water
Carbon dioxide
Cellular Waste
Excess water

5. Fluid Mosaic Model -model of the structure of a cell membrane
hyperlink
-model of the structure of a cell membrane
-discovered in 1972

6. The cell membrane:
-Composed of a phospholipid bilayer/double layer of phospholipids with proteins and some carbohydrates scattered throughout it.

7. Components of the Cell Membrane
Carbohydrate chains
Used for cell recognition
Phospholipid bilayer
Type of lipid
Contain pores/openings
Proteins:
- receptor proteins
- transporting proteins
- adhesion proteins

8. Phospholipid -type of lipid -most abundant component in the membrane
Hydrophilic Head
-water loving
-polar
Hydrophobic Tail
-water fearing
-nonpolar

9. Extracellular Fluid: Cells watery environment
Intracellular Fluid: Cells liquid center/cytoplasm

11. Several types of proteins embedded in the bilayer:
1. Receptor proteins: act as a docking area for items to attach to like hormones.

12. 2. Transporting proteins: Hyperlink
-transports items across the bilayer

13. 3. Adhesion Proteins:
-project outward from
bilayer and help cells
within a tissue to stick
together.

14. Turgor Pressure: 1. -Pressure created by water -cell loses water
-turgor pressure decreases
-cell wall bows inward
-cell shrinks in size

15. 2. Cell takes in water
- turgor pressure increases
- cell wall bulges out
- cell swells