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HOMEOSTASIS and the PLASMA MEMBRANE

Objectives. Explain the function of the plasma membrane.Relate the function of the plasma membrane to the fluid mosaic model.. . Homeostasis Key

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HOMEOSTASIS and the PLASMA MEMBRANE

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    1. HOMEOSTASIS and the PLASMA MEMBRANE MR. YOUNG BIOLOGY

    2. Objectives Explain the function of the plasma membrane. Relate the function of the plasma membrane to the fluid mosaic model.

    3. Homeostasis Key – BALANCE! Homeostasis The equilibrium of an organism’s internal environment that maintains conditions suitable for life. Example: Human sweating Helps body maintain its proper temperature.

    4. Cells and Homeostasis How do cells maintain a balance? Control what materials enter and leave cell.

    5. Plasma Membrane – Properties The plasma membrane is selectively permeable (semipermeable). Allows some materials to pass. Water, oxygen, carbon dioxide Prevents others from passing. Proteins, carbohydrates Different cells may be permeable to different chemicals or substances.

    6. Plasma Membrane – Functions NOT just a barrier surrounding the cell. Selectivity Molecular recognition Export of wastes and cell products Import of nutrients Ability to change in response to environment

    7. Plasma Membrane – Structure

    8. Phospholipid Bilayer Lipids Organic compounds Fats + Oils Non-polar Insoluble in water (Not attracted to water) Phosphate Head Polar Water-soluble (Attracted to water)

    9. QUESTION: Most cells have a watery internal and external environment. Given this information, how might you expect the phospholipids to be arranged?

    10. Do you “love” or “fear” water?

    11. Phospholipid Bilayer

    12. Fluid Mosaic Model

    13. Proteins Most of the functions of the plasma membrane are carried out by proteins. Functions: Determine which particles can pass through membrane Serve as enzymes (accelerate chemical reactions) Act as markers Help fight disease

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