Temp below 0- phospholipids don't have much energy so they can't move very much, making them rigid
Channel proteins and carrier proteins deform and ice crystals may form piercing the membrane, making the membrane highly permeable.
Temp between 0 and 45 - phospholipids can move and aren't packed closely togetherThe membrane is partially permeable, as the temperature increases the phospholipids move more increasing permeability
Temp above 45 - the phospholipid bilayer starts to break down and the membrane becomes more permeable
Water inside the cell expands putting pressure on the membrane
Channel proteins and carrier proteins deform so they can't control what goes in and out, increasing permeability
Diffusion
The net movement of particles from an area of high concentration to a lower concerntration
What process is diffusion
Passive - requires no energy
What's the name when molecules diffuse directly through a cell membrane?
Simple diffusion
How carrier proteins work
1 A large molecule attaches to a carrier protein in the membrane
2 Protein changes shape
3 Releasing the molecule on the opposite side of the membrane
