During muscular contraction, the myosin head binds to the exposed active sites on actin to form a?
A
Motor unit
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B
Motor end plate
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C
Cross bridge
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D
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.