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The mineral ion essential for triggering muscle contraction is:

  • A calcium
  • B iron
  • C iodine
  • D only sodium

Correct answer: A. calcium

Explanation: A rise in calcium ions initiates the interaction of actin and myosin.

Concept context

Types of movement, muscle contraction, skeletal system, joints, and disorders. Important for Class 11 and NEET.

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