transport in cells

• Active transport is molecules moving from an area of low to high concentration. This uses energy.
• Diffusion is molecules moving from an area of high to low concentration. This is a passive process, meaning no energy is used.
• Osmosis is molecules moving from a high to low concentration, through a partially permeable membrane
• A partially permeable membrane is one that allows smaller molecules to pass through it but not larger ones.
• main three factors affecting diffusion are:

  concentration gradient

  temperature

  surface area
• A

  
• 1. water
  2. mineral ions
  3. energy

  
• 1. osmosis
  2. active transport because: energy is needed to move the ions from the low to high concentration