When contractile strength increases later in muscle stimulation - motor units with larger, less excitable neurons is done.
In order to improve a muscle's contractile strength, more motor units are activated through a process known as motor unit recruitment. One motor neuron and all the muscle fibres it activates make up a motor unit. Each motor unit in a muscle, which makes up all muscles, is spread throughout the muscle and interacts with fibres from other motor units.
Depending on the number of fibres and the size of the muscle, a single motor unit's muscle fibres may cover all or most of the muscle. All of the muscle fibres that a motor neuron innervates are stimulated and contract when a motor neuron is engaged. One motor neuron's activation will cause a weak, evenly dispersed muscular contraction. More muscle fibres will be stimulated as a result of more motor neurons being active, leading to a stronger muscular contraction.
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