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Chapter 7-3

Chapter 7-3. The Cell Membrane; Active & Passive Transport. Gatekeeper Semi-permeable Regulates what comes in and out of the cell Main components: proteins and phospholipids. The Cell Membrane. Found only in plant cells and bacteria cells Main function is support. Cell Wall.

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Chapter 7-3

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  1. Chapter 7-3 The Cell Membrane; Active & Passive Transport

  2. Gatekeeper • Semi-permeable • Regulates what comes in and out of the cell • Main components: proteins and phospholipids The Cell Membrane

  3. Found only in plant cells and bacteria cells • Main function is support Cell Wall

  4. Mixtures of substances • Ex. Salt + water; sugar + water Solutions

  5. The movement of molecules from an area of high concentration to an area of low concentration • Molecules tend to “spread out” • Requires no energy Diffusion

  6. When molecules are evenly spread throughout a space • Homeostasis Equilibrium Movie starring Christian Bale called “Equilibrium”

  7. The diffusion of water across a membrane • The cell membrane is selectively permeable • Watch the animation Osmosis

  8. Rule for Osmosis If the area outside the cell has more salt – then water will be sucked out of the cell

  9. U - Tubes

  10. "ISO" means the same Cells In Different Solutions

  11. Cell may burst, or organelles called “contractile vacuoles” remove excess water Hypo = less

  12. Cell will shrink or die, plants wilt Hyper = more Why is it dangerous to drink sea water? Why does pouring salt on a slug kill it?

  13. Requires no energy • Diffusion & Osmosis • Facilitated Diffusion – carrier proteins “help” molecules across the membrane Passive Transport

  14. Requires the cell to use energy • Proteins or Pumps found in the membrane move materials across ACTIVE TRANSPORT

  15. Taking “in” large molecules by the cell Endocytosis • Phagocytosis = “phood”, taking in food particles • Pinocytosis = liquid substances

  16. Removing large particles (waste) from the cell • Stuff “exits” the cell • Watch video at http://www.esnips.com/doc/2dad912f-9dcc-4936-89d9-1ae32c6125d2/Chapter-6---Endocytosis-and-Exocytosis • Or McGraw Hill Site EXOCYTOSIS

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