PATH 300 Lecture Notes - Lecture 15: Atrioventricular Node, Purkinje Fibers, Sinoatrial Node

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Insulation between the atria and the ventricles: the conduction is very controlled so the atria contract first before the delay, then the ventricles contract. Sa node: pacemaker: intrinsic rate modulated by ans. Rate is higher than any other part of the heart. Av node and h-p system: pacemaker activities, slower, can take over when given no instructions from the sa node. Pacemakers of the heart: sa node dominant pacemaker with an intrinsic rate of. 60-100 beats/minute: av node backup pacemaker with an intrinsic rate of 40-60 beats/minute, ventricular system back-up pacemaker with an intrinsic rate of 20-45 bpm. Sa node impulse will run through the myocardial muscle, which has interconnected fibers so that the whole atria and ventricles can contract in synchrony. Control of cardiac function: rate can be modulated by the autonomic nervous system (ans) to adjust for obvious demands. Sensors for pressure and the chemical compositon of the blood.

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