What Happens When Ca²⁺ Increases in the Cytoplasm of a Striated

question 4

Multiple Choice

What happens when Ca²⁺ increases in the cytoplasm of a striated muscle cell?

• A) Myosin-binding sites on actin are exposed, allowing a single cross-bridge cycle to occur.
• B) Myosin-binding sites on actin are exposed, allowing cross-bridge cycles to occur until Ca²⁺ drops again.
• C) Actin-binding sites on myosin are exposed, allowing a single cross-bridge cycle to occur.
• D) Actin-binding sites on myosin are exposed, allowing cross-bridge cycles to occur until Ca²⁺ drops again.

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