Which mineral ions are important for muscle contraction?

Explanation

**Step-by-Step Solution:**

1. **Identify the Key Mineral Ions**: The two primary mineral ions important for muscle contraction are calcium (Ca²⁺) and magnesium (Mg²⁺).

2. **Role of Calcium in Muscle Contraction**:
- Calcium ions play a crucial role in the process of muscle contraction.
- When the calcium level in the muscle cells increases, calcium binds to a protein called troponin.
- This binding causes a conformational change in troponin, which leads to the exposure of the active sites on the actin filaments.
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