Muscle contraction step 5

contraction

step 10

hydrolysis of ATP to ADP; activation and cocking of myosin head

step 11

formation of myosin-actin cross bridge

step 12

power stroke sliding of thin filament over thick filament, binding triggers release of energy

step 13

binding of new ATP; breaking of cross-bridge

sliding filament mechanism

myosin heads pull thin filaments toward M line, thick/thin filaments slide over each other, muscle shortens, filament length stays the same

rigor mortis

stiffness of death, begins 3-4 hours after death, peaks around 12 hours, disappears around 48-60 hours as muscle decomposes