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Chapter 3

3.2 Crossing the plasma membrane

TermDefinition
Simple Diffusion random movement of simple atoms or molecules from higher to lower so they are equally distributed
Osmosis Diffusion of water across a plasma membrane
Solutes Dissolved substances
Tonicity The degree to which a solutions concentration of solute-vs-water causes water to move out of the cells
Isotonic Equal concentration of solutes and solvent Cells maintain size/shape
Solvent Water
Hypotonic Solutions that cause cells to swell/burst due to an intake of H2O
Solutions Solute plus solvent
Lysis breaking or disintegration of cells
Hemolysis Disintegration of red blood cells
Hypertonic Solutions that cause cells to shrink/shrivel due to loss of H2O
Crenation Cells in condition of hypertonic
Filtration Movement of liquid from high to low pressure
Facilitated Diffusion Facilitated Transport A molecule is transported across the membrane from higher to lower concentration
Active Transport A molecule is moving opposite direction Lower to higher concentration
Cystic Fibrosis Chloride ion channels malfunction
Endocytosis A portion of the plasma membrane forms an inner pocket to surround a substance, then the membrane pinches off to form an intracellular vesicle
Phagocytosis Cell eating Allows the cell to ingest solid particles
Pinocytosis Cell drinking Allows the cell to consume solutions
Exocytosis A vesicle fuses with the plasma membrane as secretion occurs
Created by: JamieS1982
 

 



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