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Cell Membrane

Parts and Functions of the Cell Membrane

TermDefinition
Protein Channels A place where only proteins can pass through the cell membrane.
Lipid Bilayer The cell membrane as a whole. Also, it gives the membrane a flexible structure, which in turn is very strong.
Carbohydrate Chains Helps cells identify what each cell is.
Polar Lipid Heads Negatively charged head of a fat molecule that is hydropilic (likes water).
Non- Polar Lipid Tails Positively charged tail of a fat molecule that is hydrophobic (hates water).
PROCESSESS DEFINED
Diffusion Molecules move from high to low concentration without energy input, and carrier. moves directly through the lipid bilayer.
Facilitated Diffusion Movement of substance from high to low concentration. Down the concentration gradient. Through a SPECIFIC PROTEIN CHANNEL. No energy- PASSIVE
Osmosis PASSIVE-no energy needed. WATER moves from low solute concentration-more water-to high solute concentration-less water. Facilitated by AQUAPORINS which are special membrane proteins specific for water.
Active Transport Material is pumped through SPECIFIC membrane protein from low to high concentration-against the gradient. REQUIRES energy
BULK ACTIVE TRANSPORT VESICLE-MEDIATED
Endocytosis End=in; Bringing large amounts of material into the cell by fusing with membrane on the outside, forming a vesicle, which gets released to the inside.
Exocytosis Exo=exit; Expelling large amounts of material or waste from the cell by fusing with the cell membrane inside the cell, forming vesicles, which gets released to the outsid of the cell.
Fat Molecules Lipids which make up the cell membrane.
Created by: brewer4616
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