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A-Level Biology OCR A

Particles Membrane Simple Moving Area Conc Explain Paragraph

Front Explain in paragraph and diagram how substances can move across a membrane by simple diffusion.
Back Simple diffusion
  • Particles on both sides are constantly moving in random directions
  • Over time, there will be a net movement of particles from the area of high conc to the area of low conc (down a concentration gradient)
  • The particles are able to pass from one side to another directly through the phospholipid bilayer, by moving between the individual phospholipids
  • This is carried out without the assistance of membrane proteins or ATP

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