Slides in Anaerobic respiration in muscle (lactic acid)
During vigorous muscular contractions:
-your muscle cells first respire aerobically
-There would be higher frequency of breaths in order to remove carbon dioxide and take in oxygen at a faster rate.
-your heart will also begin to beat faster so that the oxygen can be transported to your muscles at a faster rate.
However, there is a limit to the increase in the rate of breathing and heartbeat.
- Since there is insufficient oxygen to meet the demands of the vigorous muscular contractions, the muscles are said to incur an oxygen debt.
- lactic acid concentrations build up slowly in the muscles and may eventually become high enough to cause fatigue and muscular pains.
- The body then needs to rest and recover.
- During the period of rest, the breathing rate continues to be fast for some time. This is to provide oxygen to the muscle cells, to repay oxygen debt.
- Lactic acid is gradually removed from the muscles and transported to the liver.
- In the liver, lactic acid oxidised to release energy.
-This energy is used to convert the remaining lactic acid into glucose.
- When all the lactic acid has been converted, the oxygen debt is repaid.