How does temperature affect cell membrane?
Both higher and lower temperature affect the ability of the cell membrane to control what gets in and out of the cell.
In high temperature the cell membrane becomes more fluid.This gives a bigger chance for some materials to get in or out through the spaces made between the phospholipid molecules as a result of this increased fluidity.
The low temperature decreases the movement of the phospholipid molecules and this leads to the formation of cracks between them. These cracks make a higher chance for certain materials to get in or out as well.