Purkinje Fibres

Purkinje fibres Purkinje fibres were first described by a Czech physiologist, Jan Evangelista Purkinje in 1839, noting that they had a different structure compared to the hold outing muscle. They are work myocardial fibres, which extend from the Bundle of His to the inner ventricular walls, complete beneath the endocardium. Rows of Purkinje cells are connected to make up each Purkinje fibre, which run along the septum of the heart, separating the adjust and left ventricles. Their main draw is to distribute the action potentials originating in the pacemaker to the ventricular cardiac muscle cells causing the ventricles to contract, rather than actually producing the contractile force. They treat away action potentials approximately eight times high-velocity than modal(a) cardiac cells. During the cardiac cycle, an electrical impulse is created at the sinoatrial lymph secretory organ (SAN), located in the right atrium, under the influence of the beneficent branch o f the autonomic nervous system. This impulse is propagated across the atria to rotate them to contract simultaneously (atrial systole) and is represented on an electrocardiogram (ECG) as the P wave. Next, the impulse travels to the atrioventricular node (AV node), located touch by the atria and ventricles.

Once the impulse vexes the AV node, it is delayed at that place onward being conducted through the fast conduction cyberspace of the bunch together of His (located in the septum), down the left and right bundle branches and in conclusion arriving at the Purkinje fibres to the myocardium of the ventricles. The time taken for an impulse from the SA ! node to reach the Purkinje fibres is represented as the P-R separation on the ECG. This enables the ventricles to contract (ventricular systole) from the bill to the base of the heart in a coordinated mood and allow the blood to lapse the ventricles via the aorta and pulmonary artery, which is represented as the QRS complex on an ECG. The T wave of an ECG represents ventricular diastole i.e. the...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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