Adaptation within a human body:
Muscle cells use glucose rapidly.
Heart, lungs and blood can't meet the extra demand for Oxygen
Aerobic respiration can't happen(there is not enough supply of raw materials: glucose
THE BODY HAS TO ADAPT AND COMPENSATE
Anaerobic respiration takes place to keep the muscles contracting for a little longer.
Muscles work without the need of Oxygen
1) Lactic acid is produced, if it builds up in the muscles it can cause pain: ie it stresses the muscles.
2) It doesn't produce as much glucose as aerobic respiration ( with oxygen)
A person's metabolic rate increases ie the rate at which different processes occur
The supply of blood to all parts of the body is bigger
Oxygen Debt occurs because the heart, lungs and blood couldn't keep up with the demand for Oxygen earlier on.