Isotonic does not cause osmotic flow of water in or

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Isotonic: Does not cause osmotic flow of water in or out of a cell - Hypotonic: Cause the cell to lose water through osmosis -> shrink - Hypertonic: Cause the cell to gain water through osmosis -> swell Facilitated diffusion: PASSIVE E.g. Glucose and amino acids bind to specific receptor site of the carrier protein Active transport: Primary Ion pumps (Na+, K+, Ca+, Mg2+) Na-K pump (exchange pump - counter-transports 2 ions at the same time) Moves substrates against the concentration gradient Requires ATP energy supply Active transport: Secondary The main transport mechanism itself does not require ATP but ATP is needed to preserve homeostasis, e.g. a high extracellular Na+ concentration -> so that glucose molecules could
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follow the Na+ ions to flow into the cells Vesicular transport: bulk transport Materials move in or out from cell in vesicles Endocytosis: taking materials into the cell via vesicles Excocytosis: Granules/ droplets (vesicles) are released from the cell Receptor-mediated endocytosis: 1. Target ligands bind to receptors of the plasma membrane 2. Areas coated with the ligands form deep pocket on the plasma membrane surface 3.
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  • Fall '19
  • Ion channel, phagosome

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