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primary active transport
molecule transported across membrane against concentration gradient
-protein pump
secondary active transport
energy derived from electrochemical gradient established by primary active transport.
ex: sodium-glucose and sodium-calcium
endocytosis
takes in particles by engulfing them in a portion of the cell membrane
phagocytosis
cell engulfs large particles or bacterial by forming a phagosome
pinocytosis
cell takes in small molecules or fluid by forming small vessicles
receptor-mediated endocytosis
selective; cell takes in substances bound to receptor proteins, which are internalized with the molecules