The anaerobic contraction of skeletal muscle causes deposition or accurmulation of

Options

A. Gluconic acid
B. Lactic acid
C. pyruvic acid
D. Hydrochloric acid

Answer

**Step-by-Step Solution:**

1. **Understanding Anaerobic Contraction**:
- Anaerobic contraction occurs when there is a lack of oxygen in the muscle cells. This typically happens during intense exercise when the oxygen demand exceeds the supply.

2. **Energy Production in Muscle Cells**:
- Muscle cells require energy to contract. Under aerobic conditions (with oxygen), energy is produced through aerobic respiration, which involves the Krebs cycle and oxidative phosphorylation. However, in anaerobic conditions, the cells must rely on anaerobic respiration.

3. **Glycolysis Process**:
- In anaerobic conditions, glucose is broken down through a process called glycolysis, which converts glucose into pyruvic acid. This process occurs in the cytoplasm of the cell and does not require oxygen.

4. **Fate of Pyruvic Acid**:
- Under aerobic conditions, pyruvic acid would enter the mitochondria and undergo the Krebs cycle. However, in anaerobic conditions, pyruvic acid cannot enter the Krebs cycle due to the lack of oxygen.

5. **Lactic Acid Fermentation**:
- Instead of entering the Krebs cycle, pyruvic acid is converted into lactic acid through a process known as lactic acid fermentation. This process allows for the regeneration of NAD+, which is necessary for glycolysis to continue producing ATP in the absence of oxygen.

6. **Conclusion**:
- Therefore, during anaerobic contraction of skeletal muscle, there is an accumulation of lactic acid. The correct answer to the question is lactic acid.

**Final Answer**: The anaerobic contraction of skeletal muscle causes deposition or accumulation of **lactic acid**.

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