During an action potential, calcium is released into the sarcoplasm, near the actin and myosin molecules. Which of the following is the best explanation of what the calcium does?

The calcium binds to the actin and myosin and makes them work together.

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The calcium causes the release of acetylcholine.

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The calcium removes the tropomyosin block.

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The calcium breaks apart ATP to ADP and P.

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Solution

The correct option is C
The calcium removes the tropomyosin block.

The sarcoplasmic reticulum has a lot of stored calcium. The formation of a cross bridge is initiated when a calcium ion released from a sarcoplasmic reticulum bind to troponin. this binding causes troponin to change shape. with this the tropomyosin moves away from the myosin binding site on actin, allowing the myosin head to bind to the actin and form a cross bridge.

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Similar questions

C a^{2 +}

During an action potential,what is the role of calcium?

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

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.

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