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Myosin Molecule

Name the ion ...

Question

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction

A

Sodium

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B

Potassium

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C

Calcium

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D

Magnesium

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Solution

The correct option is C Calcium
Calcium ions bind to the troponin and tropomyosin molecules in the actin filaments of the muscle cells. The binding of calcium allows the troponin to change shape and expose the actin-myosin binding site. Thus calcium is responsible for cross-bridge activity during muscle contraction.

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Similar questions

Q. Name the ion responsible for masking active sites for myosin for cross-bridge activity during muscle contraction.

Q. During muscle contraction, the correct sequence of events is:

(A) Binding of myosin head to exposed active site of actin forming the cross-bridge by utilising the energy from hydrolysis of ATP

(B) Binding of

C a^{+ +}

with troponin of actin filaments and thereby removing the masking of active sites for myosin

(C) Releasing the ADP and Pi from myosin so it can go back to its relaxed state

(D) Release of acetylcholine at neuromuscular junction which generates action potential in the sarcolemma

Q. During muscular contraction, the myosin head binds to the exposed active sites on actin to form a?

Q. During the contraction of muscles, the ATP molecules bind with the active site of

Q. Name the filaments that form the cross-bridges during muscle contraction.

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