When Troponin Binds Calcium

question 84

Multiple Choice

When troponin binds calcium,

• A) it allows tropomyosin to bind actin.
• B) ion channels open, and sodium rushes into the muscle cells.
• C) it changes conformation, twisting tropomyosin and exposing the actin-myosin binding site.
• D) it changes conformation, exposing the ATP binding site and allowing the actin-myosin bond to break.
• E) calmodulin binds to calcium and starts a cascade by activating myosin kinase.

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