Research has shown that a contraction occurs in response to a release of calcium ions from the sarcoplasmic reticulum in muscle fibers. What is the role of these calcium ions in the contraction?

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The calcium ions are incorporated into ATP, which fuels the contraction process.

The calcium ions cause the thick filaments to shorten, producing the contraction.

The binding of calcium to troponin causes the tropomyosin to rotate away from the binding sites for myosin on the actin molecules, allowing myosin to bind to actin to initiate a contraction.

The calcium ions bind to the thin filaments and pull on them to produce the contraction.

 

asked Jan 1, 2013 in Biology by anonymous
    

1 Answer

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The binding of calcium to troponin causes the tropomyosin to rotate away from the binding sites for myosin on the actin molecules, allowing myosin to bind to actin to initiate a contraction.

 

answered Jan 1, 2013 by anonymous

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