# data[].attributes.body
Step 4: Cocking of the myosin head. As ATP is hydrolyzed to ADP and p, the myosin head returns to its prestrike high-energy or "cocked" postion

# data[].attributes.body
Step 3: Cross bridge detachment. After ATP attaches to myosin, the link between myosin and actin weakens and the myosin head detaches

# data[].attributes.body
step 2: The power stroke. ADP and p are released and the myosin head pivots and bends, changing to its bent low energy state. As a result it pulls the actin filament toward the M line

# data[].attributes.body
step 1: Cross bridge formation, energized myosin head attaches to an actin myosin filament, forming a cross bridge

# data[].attributes.body
Step 3 and 4: Ca2+ combines with troponin and removes the blocking actin of tropomyosin by changing the shape of actin so that the myosin binding sites are exposed and than the myosin binds to the actin forming cross bridges and contraction begins

# data[].attributes.body
Step 2: Transmission of the AP along the T-tubules cause the adjacent sarcoplasmic reticulum to release Ca2+ which flows into the cytosol

# data[].attributes.body
Step 1:  Action Potential moves down the sarcolemma and down the T-tubules

# data[].attributes.body
Brain sends a AP through the motor unit down the neuromuscular junction, a nerve impulse opens the voltage gated calcium ion channels which increases the release of Ach, Ach binds to receptor sights which activates voltage gated sodium channels, more Na+ is pumped into the cell making it depolarized, depolarization will spread to adjacent areas opening sodium channels and eventually initiating AP that moves along the lengths of the sarcolemma, Na+ stimulates a change in membrane permeability by opening K+ pumps which allow the K+ to diffuse across the sarcolemma and out of the muscle fiber