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Cell Membrane & Transport
Transcript of Cell Membrane & Transport
the Cell Membrane? Concentration gradient (high to low) must exist
Lipid soluble WITH/DOWN the concentration gradient
from high to low concentration
NO ATP (energy) needed
needs a transport (pump) protein
AGAINST the concentration gradient
from low to high concentration
ATP (energy) needed
What determines if a molecule can just diffuse through the cell membrane? OSMOSIS Diffusion of water from a high water concentration (low solute) to low water (high solute) concentration Diffusion Exocytosis Movement OUT of the cell
Golgi body often involved
Active due to vesicle and cell membrane movement
ex. - hormones released into blood Endocytosis Movement INTO the cell
2 forms; pinocytosis (liquid droplets) and phagocytosis (solids)
ex. - roots taking up water by plant Facilitated Diffusion when a molecule is too big
to diffuse thru, it will have a
protein channel to help