The motor neuron and all the myofibers it innervates is referred to as a __motor units__ . every time a motor neuron sends a nerve impulse to a skeletal muscle fiber, the muscle fiber will contract .
The motor unit is the association between the motor neuron and a group of fibers from the muscle.
A single muscle is composed of several motor units. The fibers composing each of them are just a little part of the whole muscle mass, meaning this is the part that will contract.
The motor unit is the basic unit from which the CNS controls motion.
The central nervous system (CNS) generates an action potential in the presynaptic membrane.
This action potential provokes the neurotransmitter release (acetylcholine, Ach) into the synaptic space.
The neurotransmitter travels through the synaptic space and reaches the postsynaptic membrane, where it binds to its receptors on the skeletal muscle fiber, causing ion channels to open.
Ion interchange between the extracellular space and the cell interior triggers a series of events that end by depolarizing the muscle fiber membrane, and leading to fiber contraction.
The motor neuron and all the myofibers it innervates is referred to as a _motor unit_ . every time a motor neuron sends a nerve impulse to a skeletal muscle fiber, the muscle fiber will contract.
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