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Cell Transport 2

Cell Transport 2. Biology CP. Active transport. Requires energy (ATP ) With energy, you can move particles AGAINST the concentration gradient (from low to high). Can move particles from inside to outside, even though there is more solute on outside. Proteins in membrane.

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Cell Transport 2

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  1. Cell Transport 2 Biology CP

  2. Active transport • Requires energy (ATP) • With energy, you can move particles AGAINST the concentration gradient (from low to high) Can move particles from inside to outside, even though there is more solute on outside

  3. Proteins in membrane • Some special transport proteins help move particles across the membrane (similar to facilitated diffusion)but ONLY if ATP is providing energy

  4. 1. Na-K pump • Pumps 3 Na (sodium) ions out of the cell, and 2 K (potassium) ions into the cell, FROM AREAS OF LOW TO AREAS OF HIGH CONCENTRATION The “pump” = protein

  5. What if molecules are REALLY BIG? • Another process of active transport happens when molecules are too large to pass through a cell membrane even with the aid of transport proteins. • Vesicles are used to help them through the membrane.

  6. 2. Endocytosis • 1. Cell membrane forms pocket around material • 2. Pocket breaks off into cell, forming vesicle • 3. Fuses with lysosome to break down membrane and substance is released inside of cell

  7. Phagocytosis • A type of endocytosis • Means “cell eating” • Membrane forms “pseudopods” (false arms) to wrap around large substance • Membrane engulfs substance Amoeba

  8. Pinocytosis • Another type of endocytosis • Means “celldrinking” • Similar to phagocytosis but particles are liquid and small

  9. Exocytosis • Opposite of endocytosis • 1. Vesicles form around materials insidecell • 2. Vesicle moves toward membrane • 3. Vesicle fuses with membrane and releases substance Process cells use to get rid of waste!!!

  10. Why have transport at all? • Cells must maintain homeostasis (equilibrium)!

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