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 explicate the roles distributively play in the contraction of the heart. Contractile ·         Striated ·         Has intercalated discs - shift junctions ·         1-2 nuclei ·         Branching ·         Aerobic totally (highly enriched with mitochondria) ·         T-tubules, SR ·          artificial artificial pacemaker potential ·         If cardiac energy is stretched, it causes stronger contractions. ·         No temporal summation, lockjaw and no motor units. The myocardium ( musculus 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 together by crissc rossing CT fibers and are arranged in lock chamber or circular bundles. The interlacing bundles link all question of the heart together. The CT fibers form a dense vane call fibrous skeleton of the heart, which reinforces the myocardium internally and anchors the cardiac muscle fibers.

semiconductive ·         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 & vitamin A; 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.         SA node - generates typically impulses about 75 times a minute. Because no arctic region of the conduction system or the myocardium has a instant(prenominal) depolarization rate, the SA sets the pace for the heart. It is the hearts pacemaker and its sinus bike determines the heart rate. 2.         AV node - From the SA node, the depolarization wave spreads enlist gap junctions throughout... If you want to get a full essay, revision it on our website: OrderEssay.net

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