Question

which occurs first as a result of atp binding to myosin?
multiple choice
cross - bridge heads are cocked into an \energized\ state.
actin dissociates from myosin.
ca²⁺ is released from the sarcoplasmic reticulum.
actin binds to myosin.
cross - bridges rotate, sliding past the thin filament.

Explanation:

When ATP binds to myosin, it causes the dissociation of actin - myosin cross - bridges. This is the first step in the muscle contraction cycle related to the interaction between myosin and actin. The other events like cross - bridge cocking, calcium release, and sliding of filaments occur subsequent to this dissociation step.

Answer:

Actin dissociates from myosin.