Muscle contraction occurs in a cyclic process.Which of the following sequences is in the correct order?
A)power stroke, cross bridge formation, cross bridge dissociation, cocking of myosin
B)cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin
C)cross bridge formation, cocking of myosin, power stroke, cross bridge dissociation
D)cross bridge formation, cross bridge dissociation, cocking of myosin, power stroke
E)cross bridge formation, power stroke, cross bridge dissociation, power stroke, cocking of myosin

Question

Quizplus · Accepted Answer

1. Cross bridge formation: The myosin head attaches to the actin filament, forming a cross bridge.
2. Power stroke: The myosin head releases ADP and undergoes a conformational change. This causes the myosin head to tilt, pulling the actin filament towards the center of the sarcomere.
3. Cross bridge dissociation: ATP binds to the myosin head, causing it to detach from the actin filament.
4. Cocking of myosin: ATP is hydrolyzed, providing energy to reset the myosin head to its original conformation, poised for another cycle of cross bridge formation.

Muscle Contraction Occurs in a Cyclic Process