Gas exchange-cell membranes summary
- Created by: PusheenCat
- Created on: 27-01-22 10:53
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- Cells have membranes to protect inside organelles and controls what goes in and out of the cell
- Diffusion is is is the movement of liquid or gas particles from a high concentration area to a lower concentration area
- Ways substances move in into or out of cells depends on the cell membrane structure
Fluid mosaic model:
- Model showing that cell membranes are made up of a phospholipid bilayer, peripheral proteins, integral proteins, glycoproteins and pores
- Phospholipid bilayer: Hydrophilic heads face outwards and hydrophobic tails face inwards - create hydrophobic lipid core which contains the integral proteins
- Integral proteins: Main transport structure that can either come in the form of being a permanent pore (aka hydrophilic channel), carrier protein or active pump with enzymes-all transport types use these
- Peripheral proteins: Can be enzymes that float on cell surfaces and regulate transport via cell signalling
Diffusion:
Affecting factors: pressure, temperature and membrane thickness
Goes from area of high concentration to low concentration until there is an even distribution via…
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