Gas exchange-cell membranes summary

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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 bilayerperipheral proteinsintegral proteinsglycoproteins 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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