Lab 2_1 Skeletal Muscle Physiology Info.doc - A motor unit consists of one somatic efferent(motor neuron and all of the muscle fibers(cells that it

Lab 2_1 Skeletal Muscle Physiology Info.doc - A motor unit...

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A motor unit consists of one somatic efferent ( motor ) neuron and all of the muscle fibers (cells) that it innervates. The motor neuron and a muscle fiber intersect ant the neuromuscular junction . Specifically, the neuromuscular junction is the location where the axon terminal of the neuron meets a specialized region to the muscle fiber’s plasma membrane. This specialized region is called the motor end plate . The events that occur at the neuromuscular junction lead to the end-plate potential. An action potential in a motor neuron triggers the release of acetylcholine from its terminal. Acetylcholine then diffuses onto the muscle fiber’s plasma membrane (or sarcolemma) and binds to receptors in the motor end plate, initiating a change in ion permeability that results in a graded depolarization of the muscle plasma membrane (the end-plate potential). The end-plate potential triggers a series of events that results in the contraction of a muscle cell. This entire process is called
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