diffusion

• What is diffusion?


  Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.
• What happens to particles during diffusion?


  Particles move about and end up evenly spaced over time.
• What is the concentration gradient?


  The concentration gradient is the difference in concentration between two areas.
• How does the concentration gradient affect the diffusion rate?


  A larger concentration gradient results in a faster diffusion rate.
• How does temperature influence diffusion?


  A higher temperature increases the diffusion rate because particles have more energy and move faster.
• What types of substances can diffuse through cell membranes?


  • Very small molecules can diffuse, such as:
  • Oxygen
  • Glucose
  • Amino acids
  • Water
  • Big molecules like starch and proteins cannot fit through.
• What is the net movement of molecules through a cell membrane?


  Molecules move from an area of higher concentration to an area of lower concentration.
• What happens to the movement of molecules if there are more particles on one side of the membrane?


  There is a net movement of particles from the side with more particles to the side with fewer particles.
• How does the surface area of a cell membrane affect diffusion?


  A larger surface area increases the diffusion rate because more particles can pass through at the same time.
• What is an example of diffusion in everyday life?


  • The smell of perfume diffusing through the air in a room.
• What is needed for aerobic respiration?


  Oxygen is needed for aerobic respiration.