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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 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
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
2. Endocytosis - “cell eating” • “endo” = inside “cyte” = cell • CM in-folds around food particle, forms vesicle & digests food
2 Types of Endocytosis • a. Phagocytosis • “phag” = eat • bringing large substances into cell • Videoclip • b. Pinocytosis • “pin” = drink • bringing fluid into cell
3. Exocytosis • “exo” = out • Substances leaves cell • membrane surrounding the material fuses with cell membrane