Question

When muscles get fatigued, there is

• A. More ATP, no glycogen and no lactic acid
• B. More ATP, more glycogen and more lactic acid
• C. Less ATP and glycogen but more lactic acid
• D. Less ATP, more glycogen and less lactic acid

Answer 1

Answer: (C)

Less ATP and glycogen but more lactic acid

Muscle fatigue refers to the decreasing ability of muscles to contract, generating force. Muscle fatigue can be the result of anaerobic respiration. During power exercises such as sprinting, when the rate of demand for energy is high, glucose is broken down and oxidized to pyruvate, and lactate is produced from the pyruvate faster than the tissues can remove it due to insufficient oxygen, so lactate concentration begins to rise. The cellular degradation of the simple sugar glucose to yield pyruvic acid, and ATP as an energy source. Glycogen concentration is also less as in starvation condition glycogen is utilized to produce energy. Thus, option C is correct.