Transport - Diffusion and Osmosis Diffusion is the movement...

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Unformatted text preview: Diffusion and Osmosis Diffusion is the movement of molecules down their concentration gradient Equilibrium Osmosis Diffusion of water through a semi-permeable membrane Solutes are substances dissolved in a solution Hypertonic solution contains higher concentration of solutes than the cell Hypotonic solution contains lower concentration of solutes than the cell Isotonic solution contains equal concentration of solutes as the cell Osmosis Osmosis Movement of water into a cell creates osmotic pressure This can cause a cell to swell and burst Osmotic pressure in a red blood cell Normal shape Shape in pure water Bulk Passage into and out of Cells Large amounts of material can be moved in and out of cells by membrane-bound vesicles Exocytosis Discharge of material from vesicles at the cell surface Endocytosis The plasma membrane envelops particles and brings them into the cell interior Exocytosis Means by which hormones, neurotransmitters and digestive enzymes are secreted in animal cells...
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Transport - Diffusion and Osmosis Diffusion is the movement...

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