1. Exercise
   1. body adapts
      1. oxgen
      2. glucose
      3. more to cells for energy
   2. increase heart rate
   3. muscles
      1. muscle cells
         1. contraction
            1. respiration
            2. oxygen releases energy from glucose
            3. CO2 removed
            4. blood flows faster rate
            5. increase breath rate
            6. extra oxygen
            7. increased breath depth
            8. increase heart pump speed
            9. arteries dilate (wider|)
   4. glycogen
      1. stored glucose form food
      2. mainly in liver
      3. each muscle small supply
      4. exercise
         1. glucose uswed rapidly
         2. cell on glycogen supplies
            1. when run out
            2. no energy
            3. muscles tired
2. Anaerobic Respiration
   1. not enough oxygen in blood
   2. useful in emergencies
   3. incomplete breakdown of glucose
      1. energy
         1. not as much as aerobic respiration
      2. lactic acid
         1. builds up in muscles
         2. painful
         3. muscles tired
   4. oxygen debt
      1. repay oxygen needed in muscles
      2. breath hard after exercis
         1. O2 to muscles
            1. oxidise lactic acid
            2. CO2
            3. water
      3. brain detects
         1. CO2
         2. lactic acid
         3. maintains
            1. high pulse rate
            2. high breath rate
            3. used to rectify situation
   5. yeast
      1. anaerobic respiration
      2. byproducts
         1. ethanol
         2. carbon dioxide