Which of the following is the FIRST event that happens after an action potential strikes a skeletal muscle fiber? Myosin molecules bends their "necks". Actin molecules bind with myosin. Myosin self-assembles to form the thin filament. Calcium binds to tropomyosin. Calcium channels open.
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Step 1: After an action potential strikes a skeletal muscle fiber, calcium channels open. Show more…
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Which of the following events occurs first? Calcium binds to troponin. Myosin cross-bridges attach to actin The myosin head pivots toward the Mline The myosin head binds ATP and detaches from actin.
Calcium ions are released from the sarcoplasmic reticulum. What happens next? (a) acetylcholine is released (b) active sites on the actin filaments are exposed (c) filaments move past one another, and the muscle fiber shortens (d) myosin is activated (e) $\mathrm{P}_{i}$ is released, and the cross bridge flexes
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