GCSE Biology (AQA)
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Bioenergetics
Respiration
Exercise & Lactic Acid
2:11
Exercise and the Human Body
Spec
4.4.2.2
- During exercise, energy demand increases, necessitating more energy for muscle contractions.
- The body responds to this demand by increasing heart rate, breathing rate, and breath volume.
- Increased heart rate is measured in beats per minute.
- Increased breathing rate and volume help deliver more oxygenated blood to muscles.
- If the body cannot supply enough oxygen, incomplete oxidation of glucose occurs, leading to muscle fatigue.
- Continued exercise under these conditions can lead to anaerobic respiration, causing lactic acid buildup and oxygen debt.
- Lactic acid buildup can cause muscle cramps and pain.
- Oxygen debt refers to the extra oxygen required by the body for recovery post-exercise.
- Understanding these physiological responses is important for exams and observing these effects during exercise can be an educational experience.
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