Whenever the position of a joint is stabilized at a certain attitude, the nervous system produces this by :-   a- increasing the α-motor neuron discharge to all muscles attached to the jointb- increasing the γ-motor neuron discharge to all muscles attached to the jointc- increasing γ-motor neuron discharge to postural musclesd- co-activation of α and γ-motor neurons innervating the involved muscles

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Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.