MUSCLE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Where myosin binds to actin
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Where the calcium crosses into the cytoplasm
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Where calcium binds with troponin
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None of the answers are correct.
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Detailed explanation-1: -The globular heads of myosin bind actin, forming cross-bridges between the thick and thin filaments. It is important to note that the orientation of myosin molecules in the thick filaments reverses at the M line of the sarcomere.
Detailed explanation-2: -The movements of myosin appear to be a kind of molecular dance. The myosin reaches forward, binds to actin, contracts, releases actin, and then reaches forward again to bind actin in a new cycle. This process is known as myosin-actin cycling.
Detailed explanation-3: -A distinctive structure consisting of two globular heads on each myosin molecule which interact in the presence of calcium ions with specific sites on a thin actin filament. The cross-bridges contain ATPase and generate the tension developed by a muscle fibre during a muscle action.