Movement across cell membranes

  • Created by: emews
  • Created on: 27-10-17 11:41

Movement across cell membranes

Concentration gradients

The more particles there are in a certain volume, the more concentrated those particles are.

When sucrose is dissolved in water:

  • The solute is the sucrose
  • The solvent is the water


Diffusion is the net movement of particles from an area of high concentration to an area of low concentration.

Diffusion is going down a concentration gradient.


  • Oxygen in the lungs diffuse into red blood cells
  • A teabag placed in a cup of hot water will diffuse into the water
  • Placing food colouring in a liquid will diffuse the colouring
  • Cigarette smoke diffuses into the air


Osmosis is the net movement of water molecules from an area of low solute concentration to an area…


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