Question

Muscle fatigue occurs due to the accumulation of:
a. Pyruvic acid
b. ATP
c. Lactic acid
d. Eroman $CO_2$

Answer 1

Hint: When a person runs a long-distance or participates in a massive exercise, the person gets affected by it and feels pain in their muscles. It is due to the accumulation of a specific substance. This makes the person sense that the oxygen in his or her body is getting lower and lower. It tells the body to start the mechanism to evolve more oxygen.

Complete answer:
- When a person gets himself or herself in heavy work, the oxygen present in their body gets used up.
- Thus, Aerobic respiration takes place to give more energy, but it is a slow process. In the process like lactic acid fermentation, Anaerobic respiration takes place fast. However, it releases less amount of energy.
- On the other hand, in rapid muscular shrinkage, the muscles make lactic acid fermentation to make immediate power available for intake.
- This process involves the release of a considerable amount of lactic acid, leading to pain and muscle fatigue.
- Pyruvic acid is an intermediate product in Krebs cycle.
- ATP is an immediate source of energy stored in the body.
- Eroman $CO_2$ is an outcome of respiration.

Hence, the correct answer is option (B).

Additional information:
In the duration of muscle fatigue due to lactic acid deposition, the cytoplasm turns out to be acidic in nature. In doing so, the enzyme action gets stopped, and food is leftover and not oxidized. Since the energy is not accessible, there will be a strike in muscular contraction.

Thus, we can reduce the pain after we participate in a massive exercise on taking a hot bath or a massage. It is due to the reason that a hot bath and massage can make cytoplasm neutralize. A hot bath or massage can help cells understand the situation, and cells start to diffuse the acid present, thereby sharing equal amounts to the amount that doesn’t affect the body.

Note: Aerobic respiration process gives oxygen in the required amounts in essential duration. In absence of this mechanism in a human body may become a disaster to him or her. At the time of oxygen shortage, pyruvic acid ferments to produce lactic acid.