Myosin binds to actin, forming a cross bridge. What happens next? (a) acetylcholine is released (b) calcium ions stimulate exposure of active sites (c) myosin 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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Myosin binds to actin, forming a cross bridge. What happens next? (a) acetylcholine is released (b) calcium ions stimulate exposure of active sites (c) filaments slide past one another, and the muscle fiber shortens (d) myosin is activated (e) $P_{i}$ is released, and the cross bridge flexes.
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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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