1. Cell Membrane Structure & Molecule Transport Part 1
AP Biology
Cell Membrane Structure
& Molecule Transport
Part 1

2. Cell Membrane

3. Amphipathic Phospholipids
WATER
Hydrophilic
head
Hydrophobic
tail
WATER

4. Amphipathic Proteins Hydrophilic region of protein Phospholipid
bilayer
Hydrophobic region of protein

5. Cell Membrane

6. Membrane Protein Functions
Signal
Enzymes
Receptor
ATP
Transport
Enzymatic activity
Signal transduction

7. Membrane Protein Functions
Glyco-
protein
Cell-cell recognition
Intercellular joining
Attachment to the
cytoskeleton and extra-
cellular matrix (ECM)

8. Cholesterol of the Membrane

9. Fluid Mosaic Model and Phospholipids
Lateral movement
(~107 times per second)
Flip-flop
(~ once per month)
Movement of phospholipids

10. Surface Area vs. Volume

11. Surface Area of the lungs (alveoli)

12. Digestive Tract Small Intestine averages 23 feet.

13. Villi and Microvilli on the interior of the small intestine
Key
Nutrient
absorption
Vein carrying blood
to hepatic portal
vessel
Microvilli
(brush border)
Blood
capillaries
Epithelial
cells
Muscle layers
Epithelial cells
Large
circular
folds
Lacteal
Villi
Lymph
vessel
Villi
Intestinal wall

14. Excretory Structures

15. Nitrogenous Waste filtering