16. A tap on the patellar tendon at the knee joint is used to test the knee-jerk reflex. All of the followings are incorrect, except ---------------------. A. This reflex involves relatively simple neuronal circuits B. The reflex starts with the 1a sensory neurons of the muscle tendon C. There is an inhibitory stimulus to the motor pool of the extensor muscle D. There is a stimulation of the excitatory interneuron of the flexor muscle E. Excitation of the flexor muscle fibers causes the knee extension

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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.