Anaerobic breakdown of glycogen due to repeated activation of muscles leads to accumulation of

Options

A. Uric acid
B. Phenylalanine
C. Lactic acid
D. Glutamic acid.

Answer

**Step-by-Step Solution:**

1. **Understanding Glycogen Breakdown**: Glycogen is a stored form of glucose in muscles and liver. During intense physical activity, muscles require energy, which is obtained by breaking down glycogen into glucose.

2. **Glycolysis Process**: The breakdown of glucose occurs through a process called glycolysis. This process can occur in both aerobic (with oxygen) and anaerobic (without oxygen) conditions.

3. **Anaerobic Conditions**: In the scenario described, repeated activation of muscles leads to anaerobic conditions, meaning there is insufficient oxygen available for complete aerobic respiration.

4. **End Product of Glycolysis**: Under anaerobic conditions, glycolysis still occurs, but the end product, pyruvate, cannot enter the aerobic pathway (TCA cycle) due to the lack of oxygen.

5. **Conversion to Lactic Acid**: Instead, the pyruvate is converted into lactic acid (or lactate) through a process known as lactic acid fermentation. This accumulation of lactic acid is a result of the anaerobic breakdown of glycogen.

6. **Conclusion**: Therefore, the accumulation due to the anaerobic breakdown of glycogen in muscles leads to the buildup of lactic acid.

**Final Answer**: The anaerobic breakdown of glycogen due to repeated activation of muscles leads to the accumulation of **lactic acid**.

---