transport in cells

• give types of transport in cells

  diffusion, osmosis and active transport
• describe diffusion

  passive movement of substances from area of high concentration to area of low concentration
• give examples of substances transported by diffusion

  oxygen, carbon dioxide, glucose and amino acids
• give factors affecting rate of diffusion

  temperature, surface area and concentration gradient
• describe affect of temperature on rate of diffusion

  higher temperature - faster rate

  lower temperature - slower rate
• describe affect of surface area on rate of diffusion

  larger surface area - faster rate

  smaller surface area - slower rate
• describe affect of concentration gradient on rate of diffusion

  larger concentration gradient - faster rate

  smaller concentration gradient - slower rate
• describe osmosis

  passive movement of water molecules from area of high concentration to area of low concentration across partially permeable membrane
• describe active transport

  active movement of substances from area of low concentration to area of high concentration that requires energy from respiration
• give examples of active transport

  gut and root hair cells
• describe active transport in gut

  absorption of sugar molecules from blood to gut for respiration
• describe active transport in root hair cells

  absorption of water and mineral ions from soil to root hair cell for plant growth