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Which ion plays a key role in initiating muscle contractions and nerve activities?

1. Calcium ions (Ca2+) are crucial for starting muscle contractions and nerve functions.
2. Potassium and sodium ions (K+ and Na+) help maintain the proper electrical charge across cell membranes.
3. Magnesium ions (Mg2+) serve as a cofactor in ATP hydrolysis.
4. None of these options are correct.

Correct answer: Calcium ions (Ca2+) are crucial for starting muscle contractions and nerve functions.

Solution

Ca2+ ions play a crucial role in muscle contraction and nerve function by acting as a signal in cellular processes.

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