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Transcript
Active Transport Active Transport Mechanisms Require cell energy Energy is provided by the cell Molecules can move against the conc gradient (from low conc to high conc) Types of Active Transport Mechanisms Proteins pumps Endocytosis Exocytosis Protein Pumps Carrier proteins “pump” molecules across the cell membrane Carrier proteins change shape as they “pump” the ions/molecules across the membrane Requires cell energy Ca pump-moves Ca ions from one part of a skeletal muscle cell to another part so the cell will contract Sodium-potassium pump-moves sodium out of the cell and potassium into the cell Endocytosis The engulfing of materials to bring into a cell Pocket of cell membrane breaks off into the cell=vesicle Phagocytosis=cell eating Pinocytosis=cell drinking Exocytosis Aldosterone Movement of large molecules out of the cell Reverse of endocytosis Vesicles attach to the cell membrane and open to allow the contents of the vesicle out Used for waste materials