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Active Transport

Active Transport. Movement of molecules across the CM. Requires energy ! Movement of molecules against conc. gradient move from L  H. This is gonna be hard work!!. high. low. carrier proteins move substances against their concentration gradient. 1. Membrane Pumps.

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Active Transport

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  1. Active Transport Movement of molecules across the CM

  2. Requires energy! Movement of molecules against conc. gradient move from L  H This is gonna be hard work!! high low

  3. carrier proteins move substances against their concentration gradient 1. Membrane Pumps

  4. Example: Sodium (Na) - Potassium (K) Pump • 3 Na move out of the cell, 2 K move in • Importance – prevents cells from lysis by removing excess Na • Videoclip

  5. Na/K Pump

  6. 2. Endocytosis - “cell eating” • “endo” = inside “cyte” = cell • CM in-folds around food particle, forms vesicle & digests food

  7. Examples of Endocytosis

  8. 2 Types of Endocytosis • a. Phagocytosis • “phag” = eat • bringing large substances into cell • Videoclip • b. Pinocytosis • “pin” = drink • bringing fluid into cell

  9. 3. Exocytosis • “exo” = out • Substances leaves cell • membrane surrounding the material fuses with cell membrane

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