Diffusion

Diffusion: the spreding of particles from an area of high concentraction to low concentration.

Speeding up: 

• Heat the particles
• Bigger the difference in concetration => Faster the rate of diffusion
• Moist Surfaces

Can happen in: 

• Open spaces
• Cell membrances

Diffusion across membranes: 

• Small molecules are able to pass through eg. co2, O2
• Thin/ partically permable membrances
• Diffusion goes both ways => passive procces
• Large concentration gradient

Osmosis: The movement of water across a partially permable membrane from on area of high concentration to low concentration.

Active Transport: 

• The movment of substances across cells 
• Against a concentration gradient => goes from low to high
• Moves a subsatnce through the cell
• Uses energy => biological
• Protiens move substances by changing shape
• Protien channels and protiens are randomly distbuted
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