diffusion and osmosis

• What is the definition of diffusion?

  The movement of molecules from high to low concentration
• Which molecules move in osmosis?

  Water
• What do the molecules move through in osmosis?

  Semi-permeable membrane
• What is the definition of active transport?

  The movement of molecules from low to high concentration
• What does active transport require?

  Energy
• How does an increase in organism size affect the surface area to volume ratio?

  It decreases
• How are the alveoli adapted for their function?

  • One cell thick
  • Large surface area
  • Good blood supply
• How are the villi adapted for their function?

  • One cell thick
  • Large surface area
  • Good blood supply
• How is a leaf adapted for its function?

  • Air spaces
  • Large surface area
• How are the lamellae in fish gills adapted for their function?

  • Increase surface area
  • Good blood supply