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Cell Membrane & Transport

Outlines the main methods of transport through the cell membrane; simple diffusion, facillitated diffusion, osmosis, active transport, endocytosis and exocytosis

Mark McLean

on 30 September 2011

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Transcript of Cell Membrane & Transport

the Cell Membrane? Concentration gradient (high to low) must exist
Small enough
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
Full transcript