1.during vigorous activities, the breathing rate and heart beat rate increases to supply sufficient oxygen for rapid muscles contraction
2. however, the supply of oxygen is still not enough and muscle cells have to carry out anaerobic respiration
3. the main substrate is anaerobic respiration.
4. glucose is broken down to form lactic acid and energy for muscles contraction. only a small amount of energy is produced cause the glucose broken down partially.
5. the energy released is used to produce ATP. some lost as heat.
6. accumulation of lactic acid causes muscles fatigue.
7. lactic acid is transported back to the liver. 20% lactic acid is used for aerobic respiration to produce energy, CO2 and water.
8. oxygen is required for aerobic respiration. rapid breathing and heart beat rate continues. oxygen break down lactic acid built in muscles.
9. energy produced frm aerobic respiration used by liver cells to convert back lactic acid to glucose
10. oxygen debt occurs because the oxygen demand is more than the supply of oxygen. when all the lactic acid is oxidised, oxygen debt is paid
11. chemical equation : C6H12O6 = 2C3H6O3 + energy
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