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Diffusion
high to low concentration
small uncharged molecules
passive
Facilitated diffusion
hydrophilic ions
through channel proteins
Osmosis
free water molecules
through phospholipid
Active transport
low to high concentration
(against concentration gradient)
through carrier proteins
requires energy
Exocytosis
bulk transport out of a cell
vesicles fuse with surface membrane releasing their contents
Endocytosis
bulk transport of substances into cell
vesicles are created from cell surface membrane bringing contents into cell
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