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

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.