Refer to the electromyogram (EMG). Select the correct statements. motor unit motor uniti motor unit A. EMG 1 sec force Force production is modulated by recruitment of motor units. A motor unit is composed of a few muscle fibers innervated by an upper motor neuron. According to the Henneman's size principle, the large motor units will be recruited followed by the small motor units. Small motor units have small cell body. Large motor units have many fast twitch Type I muscle fibers. Small motor units have lower threshold and 'high' excitability. Large motor units produce high tetanic tension and contraction speed.

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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.