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PTECH Physiology QUESTION #3189
Question 1
In muscle contraction, $Ca^{2+}$ ions bind to which protein to expose the binding sites on actin?
  • Myosin
  • Troponin✔️
  • Tropomyosin
  • Actin
Correct Answer Explanation
Calcium binding to troponin causes tropomyosin to move, allowing myosin to attach to actin.