What is the location of troponin in the process of muscle contraction?

Attached to myosin filament

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Attached to tropomyosin

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Attached to myosin cross bridge

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Attached to T-tubule

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Solution

The correct option is B Attached to tropomyosin
The proteins troponin and tropomyosin are closely associated with actin. Troponin is a complex of three polypeptide chains- $T_{n} C, T_{n} I a n d T_{n} T . T_{n} C$ binds to $C A^{2 +}, T_{n} I$ binds to actin and $T_{n} T$ binds to tropomyosin.

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Similar questions

ATPase of the muscle is located in

(a) actinin (b) troponin (c) myosin (d) actin

Arrange the changes during muscle activation as they happen

1. Calcium level increases.

2. Calcium level decreases.

3. Troponin and tropomyosin move to allow myosin to bind to actin.

4. The cross bridge cycle begins.

What is the correct sequence of events in the cross bridge formation?

i. The power stroke

ii. Cross bridge formation

iii. Myosin head is activated by ATP

iv. Calcium released binds to the troponin unblocks the actin sites

v. Cross bridge detachment

vi. Reactivation of the myosin head

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