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Annmarie Johnson A&P I July 25, 2012 Stretch Reflex and the involuntary uneasy System (A) The open inborn innate reflex is the torsos answer to a quick musculus stretch. The animate at which the stretch occurs go give away induce receptors located indoors skeletal go across called vigour ear fibers. If the stretch is slow, these receptors ar not stimulated. The muscle spindle plays an active role in the stretch reflex. The stretch reflex is an involuntary receipt (contraction) to external stimuli that stretch the muscle. When the spindle is stretched it sends step to the fore a signal to the spinal cord, which in turn sends a signal back to the muscle causing it to contract. The strength of the response of the muscle spindle is determined by the rate of stretch. This gist the greater and more quickly a load is give to the muscle, the more forceful the muscular contraction will be. Muscles and tendons be quickly stretched creating and then storing elastic energy.  Immediately following the stretch, a concentric muscle contraction releases the stored energy.  This is considered to be resultant from a series elastic component (SEC) which causes the muscle to act same(p) a stretched spring wanting to return to its original length.

  As a result the SEC contributes to the total force produced by of course returning the muscles and tendons to the length prior to the stretch.  If an eccentric strain lasts likewise long or requires a greater exploit in the joint, the stored energy is diminished. (Baechle, T.R. & Earle, 2000) When jumping up in the air, post is modif! y with a countermovement prior to the jump. If the countermovement was performed slowly or a gaolbreak was implemented at the bottom of the countermovement, the result would be reduced power. Stimulation of the muscle spindle fibers result in a reflex loop that stimulates muscle contraction. As the muscle is stretched, receptors in the muscle (muscle spindle fibers) interpret the rate of stretch within the...

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