What role do calcium ions (Ca²⁺) play in muscle contraction according to the sliding filament theory?

Question

What role do calcium ions (Ca²⁺) play in muscle contraction according to the sliding filament theory?
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Solution 1

According to the sliding filament theory, calcium ions (Ca²⁺) play a crucial role in muscle contraction. Here's how:

  1. At rest, the myosin-binding sites on the actin filaments within the muscle fiber are blocked by tropomyosin, a protein that prevents interaction between myosin and actin.

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