During strenuous exercise glucose is converted into(a) Glycogen(b) Pyruvic acid(c) Starch(d) Lactic acid

During strenuous exercise, glucose is primarily converted into lactic acid.

Explanation:

Glucose metabolism:

Under normal conditions, glucose is broken down in the presence of oxygen through a process called aerobic respiration. This process produces energy (ATP), carbon dioxide, and water.
Oxygen availability during exercise:

During strenuous exercise, the demand for energy increases rapidly. If the oxygen supply to muscles is insufficient to meet this demand, the cells switch to anaerobic respiration.
Anaerobic respiration:

In anaerobic respiration, glucose is partially broken down into pyruvic acid. However, due to the lack of oxygen, the pyruvic acid is converted into lactic acid to regenerate NAD+ (an essential coenzyme for glycolysis).
Result:

The accumulation of lactic acid in muscles causes temporary fatigue and soreness, which is often experienced after intense physical activity.
Correct answer: (d) Lactic acid.