Discuss of role of `Ca^(2+)` ions in muscle contraction. Draw a neat sketch to illustrate your answer

Explanation

### Step-by-Step Solution

1. **Introduction to Muscle Contraction**:
- Muscle contraction is a complex process that involves the interaction of various proteins and ions. Calcium ions (Ca²⁺) play a crucial role in initiating and regulating this process.

2. **Role of Calcium Ions**:
- When a muscle fiber is stimulated by a nerve impulse, calcium ions are released from the sarcoplasmic reticulum into the cytoplasm of the muscle cell.
- The increase in Ca²⁺ concentration in the cytoplasm is the trigger for muscle contraction.
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