What electrolyte inactivates troponin and allows actin and myosin to form a bridge enabling the muscle fibers to contract?
A) Magnesium
B) Calcium
C) Potassium
D) Sodium
B
Feedback:
Calcium must be present to deactivate troponin so that actin and myosin can react to form actinomycin bridges. Potassium, sodium, and magnesium do not affect troponin.
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