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Transport across cell membranes Categorise
Target Level
C
Running Total
0
0%
Attempt
1 of 3
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Simple diffusion
Facilitated diffusion
Active transport
Co-transport
Osmosis
Indirectly uses ATP
Involves the use of carrier proteins and protein channels
Example: transport of oxygen
Movement of small, non-polar molecules down a concentration gradient
Example: sodium-potassium pump
Able to occur anywhere along the phospholipid bilayer
Movement of charged ions and polar molecules down their concentration gradients
Uses a gradient already set up by the action of active transport
Involves the direct use of ATP and carrier proteins
A passive process that can only occur at certain points on the phospholipid bilayer
Moves one type of substance down its concentration gradient, while another moves against its concentration gradient
Moves one type of substance against its concentration gradient
Movement of water from high water potential to low water potential
Movement across a selectively permeable membrane
Example: transport of sodium and glucose