During a muscle 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?
A) The calcium binds to the actin and myosin and makes them work together.
B) The calcium breaks apart ATP to ADP and P.
C) The calcium removes the tropomyosin block.
D) The calcium causes the release of acetylcholine.
Answer: C) The calcium removes the tropomyosin block.
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