Heart_Rate_Variation_Lab

Heart_Rate_Variation_Lab - Introduction The human heart...

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Introduction The human heart beats via a small pulse of electric current that flows throughout the body. The autonomic nervous system (ANS) regulates the electrical activity produced by the heart and spreads from top to bottom through pacemaker cells that cause the heart muscles to contract. It is vital that the electrical rhythmicity of the heart remain synchronized, if it does not then the pumping action of the heart will be compromised. The muscles must contract together to generate enough force to push the blood out of the heart’s vestiges and through the arteries and venules. Electrical signals are initiated in the sinoatrial node (SA). Neurogenic and myogenic factors such as the heart muscles strecthing influence the rate of SA depolarization (Brooks & Lange, 1977). The SA node tells the atria to contract, this signal then travels by means of Purkinje fibers to the atrioventricular node (AV), pauses briefly and then through the bundle of His and Purkinje fibers that surround the ventricles resulting in the ventricular contraction. An
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