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Cell Transport
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diffusion (passive)
definition:
molecules or ions move from regions of higher concentration to regions of lower concetration
example:
exchange of oxygen and carbon dioxide in lungs, spreading of perfume throughout a room
facilitated diffusion (passive)
definition:
same as diffusion, except carrier molecules move substances through membrane
example:
moving glucose through cell membrane
osmosis (passive)
definitio
n:
water molecules move from high concentrations of water to low concentrations of water
example:
water entering a cell
filtration (passive)
definition:
molecules move from high hydrostatic pressure (water pressure) to low hydrostatic pressure
example:
kidneys filitering waste
active transport (active)
definition:
carrier protiens move molecules from low concentration to high concentration
example:
moving amino acids
endocytosis (active)
definition:
too large molecules enter cell through a vesicle
example:
pinocytosis is the membrane eating liquid droplets
phagocytosis is the membrane eating particles
receptor-mediated endocytosis uses specific receptors to carry molecules into cell
exocytosis (active)
definintion:
vesicles for around particles that need to be expelled from membrane
example:
secretion of hormones, cell removing waste
Author
Anonymous
ID
35929
Card Set
Cell Transport
Description
Various methods of cell transport, both passive and active
Updated
2010-09-20T03:44:29Z
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