Exercise
When you EXERCISE, your body undergoes changes to ensure enough ENERGY is supplied to your CELLS.
Changes During Exercise:
- MUSCLES contract more during exercise, requiring more ENERGY from increased RESPIRATION.
- To supply OXYGEN for respiration, your BREATHING RATE, BREATH VOLUME and HEART RATE all increase.
- If the exercise is VIGOROUS like sprinting, the elevated breathing and heart rate does not provide ENOUGH oxygen for aerobic respiration so ANAEROBIC RESPIRATION takes place.
- This leads to MUSCLE FATIGUE and LACTIC ACID build up which causes the body pain and can lead to inefficiency in MUSCLE CONTRACTIONS due to fatigue.
Anaerobic Respiration and Oxygen Debt
- After the exercise is finished, your body has an OXYGEN DEBT that must be repaid to clear the LACTIC ACID that has built up.
- To repay the OXYGEN DEBT, breathing and heart rate remains HIGH even AFTER stopping the exercise.
- LACTIC ACID is transported to the LIVER to be converted back into GLUCOSE.