Which Statement About the Process of Muscle Contraction Is True

question 13

Multiple Choice

Which statement about the process of muscle contraction is true?

• A) Calcium released into the sarcoplasm binds to tropomyosin, changing the protein's conformation.
• B) When a muscle is relaxed, troponin blocks the sites on the actin filament where myosin can bind.
• C) Removal of calcium from the sarcoplasm indirectly causes tropomyosin's conformation to return to the position of blocking actin-myosin binding sites.
• D) Changes in tropomyosin's conformation twist troponin, exposing the actin-myosin binding sites.
• E) When calcium increases in the sarcoplasm, the muscle relaxes.

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Definitions:

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