Detachment of Myosin Cross-Bridges Occurs During The

Question

Detachment of myosin cross-bridges occurs during the
A) contraction phase.
B) relaxation phase.
C) stimulus phase.
D) latent period.
E) isotonic period.

Accepted Answer

Myosin cross-bridges detach during the relaxation phase of muscle contraction. This occurs when the nerve impulse ends and calcium ions are actively transported back into the sarcoplasmic reticulum, causing the tropomyosin to cover the binding sites on actin filaments and leading to detachment of the myosin cross-bridges from the actin filament.