Question

1. Explain the role of calcium in muscular function and what steps it has in the

sliding filament theory.

Answer 1

To bind with troponin.

Explanation:

Muscle contractions trigger the calcium ions to bind to the protein troponin. This leads to an exposed active binding site on the actin. The ATP will begin to bind to myosin, moving it into a high energy state, releasing it through the site. This protein will then become a filament for the binding site, changing the shape of the muscle and how it contracts. Therefore meaning, calcium is used to bind with troponin and change the shape of the actin filaments.

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