What specific event triggers the uncovering of the myosin binding site on actin?
1. Calcium ions bind to tropomyosin and change its shape.
2. Calcium release channels open in the sarcoplasmic reticulum, and calcium levels rise in the sarcoplasm.
3. Sodium ions bind to troponin and change its shape.
4. Calcium ions bind to troponin and change its shape.
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How does the myosin head obtain the energy required for activation?
1. The energy comes from the hydrolysis of ATP.
2. The energy comes from the direct phosphorylation of ADP by creatine phosphate.
3. The energy comes from the hydrolysis of GTP.
4. The energy comes from oxidative phophorylation.
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After a power stroke, the myosin head must detach from actin before another power stroke can occur. What causes cross bridge detachment?
ADP and inorganic phosphate are bound to the myosin head.
Calcium ions bind to troponin.
Acetylcholine binds to receptors in the junctional folds of the sarcolemma.
ATP binds to the myosin head.
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Calcium ions couple excitation of a skeletal muscle fiber to contraction of the fiber. Where are calcium ions stored within the fiber?
in the transverse tubules.
in the sarcoplasmic reticulum.
in the nuclei.
in the mitochondria.
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