Which of the following is a role of troponin in skeleton muscles? 1-Troponin is

Question

Which of the following is a role of troponin in skeleton muscles?

1-Troponin is the regulatory protein attached to myosin.

2- Troponin serves as a contraction inhibitory by blocking the actin binding sites on the myosin filaments.

3- Troponin is the receptor for the motor neuron neurotransmitter which initiated an action potential across sarcolemma.

4- Troponin is the receptor for the calcium on actin filament, and once calcium binds to troponin the myosin on actin is exposed and available for myosin attachment.

5- Troponin is a regulatory protein that helps release the myosin head from the actin filament to allow for not relaxation.

Explanation / Answer

The answer is: 4- Troponin is the receptor for the calcium on actin filament, and once calcium binds to troponin the myosin on actin is exposed and available for myosin attachment.

Calcium ions bind to troponin on actin filament, which detaches the tropomyosin from myosin binding site such that myosin head can bind to the actin filament.

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