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 twisting muscle. They are work myocardial fibres, which extend from the Bundle of His to the inner ventricular walls, overflowing beneath the endocardium. Rows of Purkinje cells are connected to make up apiece Purkinje fibre, which run along the septum of the heart, separating the rightfulness and left ventricles. Their main endure 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 progeny away action potentials approximately eight times prompt 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 kindly branch of the autonomic nervous system. This impulse is propagated across the atria to throw 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 encircled by the atria and ventricles.

Once the impulse vexes the AV node, it is delayed thither onward being conducted through the fast conduction network 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 ti me interpreted for an impulse from the SA no! de 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 function 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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