Final answer:
The point at which the body switches from requiring oxygen for metabolism to predominantly anaerobic metabolism is called the anaerobic threshold.
Step-by-step explanation:
The point at which the body switches from metabolism requiring oxygen to primarily anaerobic metabolism is called the anaerobic threshold. This occurs during intense exercise or strenuous physical work when oxygen depletes in the muscles. Under anaerobic conditions, glucose is converted to lactate to produce energy.