Cell Membrane Structure & Molecule Transport Part 1

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CELL MEMBRANE STRUCTURE & FUNCTIONS

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Presentation transcript:

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

Cell Membrane

Amphipathic Phospholipids WATER Hydrophilic head Hydrophobic tail WATER

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

Cell Membrane

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

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

Cholesterol of the Membrane

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

Surface Area vs. Volume

Surface Area of the lungs (alveoli)

Digestive Tract Small Intestine averages 23 feet.

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

Excretory Structures

Nitrogenous Waste filtering