Name the ion responsible for unmasking of active sites for myosin for crossbridge activity during muscle contraction.

A Calcium
B Magnesium
C Sodium
D Potassium

Verified Solution

Answer & Solution

Correct Answer

(A) Calcium

Step-by-step Solution

Detailed explanation

(a) : Calcium ion plays an important role in muscle contraction. Calcium ions bind to troponin causing a change in its shape and position. Thus, in turn alters shape and position of tropomyosin to which troponin binds. This shift exposes the active sites on Factin molecules. Myosin crossbridge are then able to bind to these active sites.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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C. Pleiotropy	III. Phenylketonuria disease in humans
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Name the ion responsible for unmasking of active sites for myosin for cross­bridge activity during muscle contraction.

Step-by-step Solution

Name the ion responsible for unmasking of active sites for myosin for crossbridge activity during muscle contraction.