alleryIn skeletal muscle, calcium binds to which protein to expose actin sites?
AMyoglobin
BTroponin
CCollagen
DMyosin tail
Answer & Solution
Correct answer: B. Troponin
Calcium released into sarcoplasm binds a troponin subunit. This changes the regulatory arrangement on thin filaments and exposes sites on actin for myosin cross-bridges. ATP hydrolysis supplies energy for filament sliding.
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