What happens when Ca 2+ increases in the cytoplasm of a striated muscle cell?

When Ca 2+ increases in the cytoplasm, it binds to troponin, causing a conformational change that exposes myosin-binding sites on actin, allowing cross-bridge cycles to occur until Ca 2+ levels drop.

What happens when Ca 2+ increases in the cytoplasm of a striated muscle cell?

When Ca 2+ increases in the cytoplasm, it binds to troponin, causing a conformational change that exposes myosin-binding sites on actin, allowing cross-bridge cycles to occur until Ca 2+ levels drop.

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

Question 15

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.

Correct Answer: