Compare and contrast the conductive versus the conductive versus the contractile cardiac muscle fibers.

Compare and contrast the conductive versus the conductive versus the contractile cardiac massiveness fibers. Describe their arrangement in the heart and formulate the roles distributively play in the contraction of the heart. Contractile ·         Striated ·         Has intercalated discs - hatchway junctions ·         1-2 nuclei ·         Branching ·         Aerobic totally (highly enriched with mitochondria) ·         T-tubules, SR ·          artificial pacesetter potential ·         If cardiac energy is stretched, it causes stronger contractions. ·         No temporal summation, tetanus and no motor units. The myocardium ( pass heart) made up of mainly cardiac muscle forms most of the heart. Myocardium is the layer that actually contracts. Within the myocardial layer, the branching cardiac muscle cells are joined in concert by crisscrossing C T fibers and are arranged in peal or circular bundles. The interlacing bundles link all feign of the heart together. The CT fibers form a dense brand call fibrous skeleton of the heart, which reinforces the myocardium internally and anchors the cardiac muscle fibers. semiconducting ·         Do not contract ·         Do not have striations ·         Pacemaker potential due to decrease in K+ permeability ·         No Na+ gates Conductive muscle fibers are located in the inspissations: ·         SA node (Right atrium) ·         AV node (Between atrium & angstrom unit; ventricular walls) ·         Bundle of His (Septum & amp; ventricular) ·         Purkinje (Septum & ventricular walls) Pacemaker potential (spontaneously changing tissue layer potential) initiates the AP, which disperse throughout the heart to trigger its cadenceic contractions. 1.     Â Â Â Â Â SA node - generates typically imp! ulses about 75 times a minute. Because no adversary region of the conduction system or the myocardium has a fast depolarization rate, the SA sets the pace for the heart. It is the hearts pacemaker and its sinus turn determines the heart rate. 2.         AV node - From the SA node, the depolarization wave spreads expend gap junctions throughout... If you want to get a full essay, society it on our website: OrderEssay.net

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