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Stack #4194526

transport

TermDefinition
simple diffusion with the conc. gradient. oxygen, carbon dioxide, lipid movement
facilitated diffusion with the conc. gradient through a channel or carrier protein. glucose, amino acids.
osmosis diffusion of water through a semi-permeable membrane.
active transport against conc. gradient using a carrier protein. Na & K pump
exocytosis secretion or ejection of materials from a cell. the material is held in a vesicle which fuses with the cell membrane and then ruptures to release its contents
endocytosis (phago/pino cytosis) when an external solid/liquid is surrounded by the cell membrane and becomes enclosed in a vesicle. white blood cells, absorptive cells of the intestine.
factors - conc. gradient tonicity
factors - surface area a small cell has a large surface area compared to a small volume. a large cell has a large surface area but also a large volume
factors - temperature + type of molecule
alveoli round shape = large surface area. one cell thick of simple sqaumous. large blood supply creates a large conc. gradient. allways moist as gases must dissolve to diffuse
Created by: Anesu8648
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