Q. Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
A) Calcium
B) Magnesium
C) Sodium
D) Potassium
Explanation
[Solution] $Ca^{2+}$ binds troponin, moving tropomyosin off the myosin-binding sites. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.