B9

• Glucose (C6H12O6)+ Oxygen(6O2) --> Carbon dioxide (6CO2) + water(6H2O)
• Aerobic reaction - Reaction transfers energy that cells can use which is exothermic. Take place in Mitochondria.
• Muscles store glucose as the carbohydrate glycogen which can be converted really quickly while exercise
• When muscle activity increase : arteries widen , heart rate increase which increases supply of oxygen.

  Breathing rate increase

  rate of co2 out increase
• Anaerobic respiration - takes place without oxygen

  Breaks down glucose incomplete

  Glucose -> Lactic acid

  Less energy
• Oxygen debt - amount of oxygen to convert lactic acid to glucose
• Oxygen debt repayment : lactic acid + oxygen -> carbon dioxide + water
• glucose -> ethanol + carbon dioxide
• Metabolism - sum of all reactions that takes in cell or body
• Role of liver : detoxify poisonous substance such as ethanol in alcohol

  passing breakdown product in blood so can be excreted as

  urine

  Breaking down old , worn out blood cells to store the iron

  until needed to synthesise more blood cells
• Removing the lactic acid(liver) : Blood flowing through the muscle transports lactic acid to liver where it converted back into glucose. If glucose not needed , stored as glycogen .