Diffusion, Osmosis and Active Transport

Diffusion

• Molecules in gases and liquids move randomly, but appear to move away from where they are concentrated to where they not so concentrated.
• Diffusion is a passive process- it does not need energy,

Osmosis

• Osmosis is the movement of water from a dilute solution to a more concentrated solution through a partially permeable membrane.
• A partially permeable membrane lets through some molecules, but not others.
• Red blood cells maintain water balance through osmosis. If a…