Active Processes - Active Processes: Active Transport:...

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Active Processes: Active Transport: movement of small molecules or ions across membrane assisted by carrier protein and against concentration gradient – from region of lower concentration to region of higher concentration - requires energy (ATP) - (e.g.: sodium-potassium pump) - secondary active transport : uses energy derived from primary active transport to drive other substances across membrane Vesicular (membrane-assisted) transport: - transport of macromolecules into or out of cell in vesicles - vesicle : small, spherical sac that has budded off existing membrane - requires energy - Exocytosis : moves macromolecules out of cell in vesicles budding off plasma membrane - Endocytosis : moves macromolecules into cell through vesicles budding off plasma membrane - Phagocytosis : endocytosis of large food particles or invading cells (bacteria) - common in macrophages of the immune system - Pinocytosis (bulk-phase endocytosis) : endocytosis of a liquid or very small particles (sampling of extracellular environment)
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Active Processes - Active Processes: Active Transport:...

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