Sliding Filament Theory

I band gets smaller

Z lines move closer together

H bands decrease

Zones of overlap get larger

Actin Filaments Slide toward center of the sarcomere aside of stationary mysosin filaments

Cross Bridges created when myosin heads connect to active sites on actin Filaments

Power stroke: attach, pivot, detach, return

Irritability: the ability to receive and respond to a stimulus

Contractility: the ability to shorter when stimulus is received

Nerve Stimulus & action potential: one motor neuron may stimulate a few muscle cells or hundreds of them depending on the particular muscle and the work it does

Motor unit: one neuron and all skeletal Muscle cells it stimulates

Neuromuscular Junction: where axon terminals form junctions with the sarcolemma