1. CELL (PLASMA) MEMBRANE
Chapter 4 Pg

3. Homeostasis Balanced internal conditions of cells
Maintained by cell membrane controlling what enters or leaves cell.

4. Cell (Plasma) Membrane
Function:
Protective barrier
Semi-permeable: Regulated transport of molecules in and out of cell

5. Cell (Plasma) Membrane
Function:
Protective barrier
Semi-permeable: Regulated transport of molecules in and out of cell
Allow cell recognition
Interact with the environment

6. Structure
Phospholipid Bilayer - Two layers of phospholipids

7. Structure Phospholipid Bilayer - Two layers of phospholipids
Phospholipid contains:
2 fatty acid chains that are nonpolar (hydrophobic)
Polar head (hydrophilic)

8. Structure Phospholipid Bilayer - Two layers of phospholipids
Phospholipid contains:
2 fatty acid chains that are nonpolar (hydrophobic)
Polar head (hydrophilic)
Fatty acid tails create a hydrophobic center

10. Membrane Structure
2. Membrane Proteins-embedded in the lipid layer
a. Integral Proteins: extend through both sides of membrane

11. Membrane Structure
2. Membrane Proteins-embedded in the lipid layer
a. Integral Proteins: extend through both sides of membrane
Receptor Proteins: binds to substances outside the cell

12. Membrane Structure
2. Membrane Proteins-embedded in the lipid layer
a. Integral Proteins: extend through both sides of membrane
Receptor Proteins: binds to substances outside the cell
Transport (channel) Proteins: Aids in moving substances across membrane
Glycoproteins (with Carbs): cell identification

13. Membrane Structure
2. Membrane Proteins-embedded in the lipid layer
b. Peripheral Proteins: only on one side of membrane
-Enzymes (assist in chemical reactions)

14. Membrane Structure
3. Cholesterol in bilayer for strength

15. Blue Biology Textbook
Draw Figure 4-10 Pg. 77
Draw Figure 4-11 Pg. 78
Cell membrane coloring