cell transport Flashcards
The plasma(cell) membrane is a barrier, these things can go in and other things can go out
Nutrients must go in
Products and wastes must get out
this determines what moves in and out of a cell, and a membrane
permeability
impermeable def
lets nothing in or out
Lets anything pass
freely permeable
restricts movement
selectively permeable (ex. cell/plasma membrane)
Permeability of plasma membrane
selectively permeable
some materials can move freely, others are restricted,
Selective permeability restricts materials based on:
▪Size
▪Electrical charge
▪Molecular shape
▪Lipid solubility
Transport through a plasma membrane can be
active or passive
requires energy and ATP
active
no energy required
passive transport
describe transport of diffusion
passive
carrir mediated transport
passive or active
vesicular transport
active
