During muscular contraction, the myosin head binds to the exposed active sites on actin to form a?

Motor unit

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Motor end plate

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Cross bridge

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None of the above

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Solution

The correct option is B Cross bridge
C. Cross bridge
EXPLANATION: During muscle contraction cycle the energy released during ATP hydrolysis, which changes the angle of the myosin head into a 'cocked' position. During this time myosin is ready to bind to actin if the sites are available. As soon as the actin-binding sites are uncovered, the high-energy myosin head bridges the gap and forms cross-bridge.

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Similar questions

C a^{+ +}

What is the correct sequence of events in the cross bridge formation?

i. The power stroke

ii. Cross bridge formation

iii. Myosin head is activated by ATP

iv. Calcium released binds to the troponin unblocks the actin sites

v. Cross bridge detachment

vi. Reactivation of the myosin head

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