Question

Kathy has been exercising vigorously for the past half hour. Her body feels sore and she feels pain in her limbs. What could be the reason for this?Select one of the options below as your answer:
A. Accumulation of lactic acid in the muscles of her limbs
B. Accumulation of alcohol in the muscles of her limbs
C. Accumulation of CO2 in the muscles of her limbs

Answer 1

Out of the choices given, the reason why Kathy's body feels sore and she has pain in her limbs after vigorously exercising is an accumulation of lactic acid in the muscles of her limbs. The correct answer is A. 

Answer 2

The right option is; A. Accumulation of lactic acid in the muscles of her limbs

Accumulation of lactic acid in the muscles of her limbs is the reason for this.

During strenuous exercise when the body requires high energy due to insufficient supply of oxygen, the body generates energy anaerobically and there is formation and accumulation of lactate (lactic acid) in the muscle. High lactate levels in the muscle increase the acidity of the muscle cells, and it also cause the disruptions of other metabolites. This result in feelings of painful sensation and soreness in active muscles.