Lactic acid generated during muscle contraction is elaborated to form glycogen in

Options

A. Liver
B. Pancreas
C. Kidney
D. Muscle.

Answer

**Step-by-Step Solution:**

1. **Understanding Muscle Contraction**: During vigorous muscle contraction, energy is required, which is primarily derived from glucose. This process begins with glycolysis, where glucose is broken down to produce ATP (adenosine triphosphate).

2. **Formation of Lactic Acid**: When muscles contract repeatedly and oxygen levels are low, the pyruvate produced from glycolysis is converted into lactic acid (lactate) instead of being fully oxidized. This process occurs anaerobically (without oxygen).

3. **Accumulation of Lactic Acid**: Lactic acid can accumulate in the muscles during intense exercise, leading to fatigue and discomfort. To prevent this accumulation from causing harm, the lactic acid needs to be transported out of the muscles.

4. **Transport to the Liver**: The lactic acid is released into the bloodstream and transported to the liver. The liver is the primary organ responsible for processing lactic acid.

5. **Conversion to Glucose**: In the liver, lactic acid undergoes a process called gluconeogenesis, where it is converted back into glucose. This glucose can then be used for energy production during muscle contraction.

6. **Storage as Glycogen**: The glucose produced in the liver can be stored as glycogen, which serves as a readily available energy source for future muscle contractions.

7. **Conclusion**: Therefore, the lactic acid generated during muscle contraction is elaborated to form glycogen primarily in the liver.

**Final Answer**: The correct alternative is the **liver**.

---