Diffusion

• What is diffusion?

  The spreading out of particles from an area of higher concentration to an area of lower concentration
• Where does diffusion happen?

  Solutions and gases
• What happens is the concentration gradient is bigger?

  The diffusion will be faster
• What do cell membranes do?

  Hold the cell together and let dissolved substances move in and out by diffusion
• What can diffuse through cell membranes?

  Oxygen, glucose, amino acids and water
• What can't fit through the cell membrane?

  Big molecules like starch and proteins
• What happens if the surface area of the cell membrane is larger?

  The diffusion rate is faster