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18 May, 04:30

Explain how skeletal muscle contracts ib biology

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  1. 18 May, 07:10
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    Answer and explanation;

    Contraction of skeletal muscles;

    -An action potential from a motor neuron triggers the release of Ca2 + ions from the sarcoplasmic reticulum.

    -Calcium ions expose the myosin heads by binding to a blocking molecule (troponin complexed with tropomyosin) and causing it to move.

    -The myosin heads form a cross-bridge with actin binding sites.

    -ATP binds to the myosin heads and breaks the cross-bridge.

    -The hydrolysis of ATP causes the myosin heads to change shape and swivel - this moves them towards the next actin binding site.

    -The movement of the myosin heads cause the actin filaments to slide over the myosin filaments, shortening the length of the sarcomere.

    -Via the repeated hydrolysis of ATP, the skeletal muscle will contract.
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