Exchanging Substances

• What are the three main factors that affect the movement of substances?

  Surface area to volume ratio, rate of diffusion, osmosis, and active transport
• How does surface area to volume ratio influence the rate of diffusion?

  A higher surface area to volume ratio increases the rate of diffusion
• What are the three main processes involved in the movement of substances?

  • Diffusion
  • Osmosis
  • Active transport
• What is the definition of diffusion?

  Diffusion is the movement of substances from an area of higher concentration to an area of lower concentration
• What is osmosis?

  Osmosis is the movement of water across a semi-permeable membrane
• What is active transport?

  Active transport is the movement of substances against a concentration gradient using energy
• How do diffusion, osmosis, and active transport differ in terms of energy usage?

  Diffusion and osmosis are passive processes, while active transport requires energy