Question

Name the substances whose build up in the muscles during vigorous physical exercise may cause cramps?
(a) Ethanol + Carbon dioxide + Energy
(b) Lactic acid + Energy
(c) Carbon dioxide + Water + Energy
(d) Pyruvate

Answer 1

The substances whose build-up in the muscles during vigorous physical exercise may cause cramps are Lactic acid + Energy (Option - b)

• In absence of oxygen or anaerobic conditions, muscles undergo anaerobic respiration to produce energy quickly required during exercise.
• During vigorous exercise, a lack of oxygen reaching the muscles leads to their switching towards anaerobic respiration and accumulation of lactic acid.
• It produces lesser energy as compared to aerobic respiration.
• This produces an oxygen debt that needs to be repaired or cleared after the exercise stops as it can cause toxicity as it decreases the pH of the blood (acidic).
• Sometimes due to the large deposition of lactic acid, the individual undergoes cramps or even become unconscious or faint.

Answer 2

Answer:

b) Lactic acid + Energy

Explanation:

Lactic acid and energy are built up in the muscles during vigorous physical exercise. The build-up of lactic acid leads to cramps.

Lactic acid is usually produced during anaerobic respiration.

During vigorous exercise the body does not get enough oxygen therefore, the muscles switch to anaerobic respiration, thereby leading to the production of lactic acid.

This accumulation of lactic acid results in the build-up of an acidic environment which results in cramping.

Anaerobic respiration is a faster method of generating energy but the amount of energy generated is comparatively less.