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ANAT 103 - Lecture Notes - Week 5.docx - lOMoARcPSD|7357004...

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lOMoARcPSD|7357004Influence on the Conduction SystemAutorthmic fibers in the SA node are the natural pacemaker of theheart because they initiate action potential most oftenSignals from the nervous system and hormones can modify the heart rateand force of contraction but they do not set the fundamental rhythmAction Potential in a Ventricular FiberAction potential in the ventricular contractile fiber is characterized by a rapiddepolarization, plateau and repolarizationExcitable cell haves sodium channels and potassium channels for excitable cells(muscles and nerves)Sodium channels are the first thing that opens when the cells are excitable,once open sodium will rush into the cell, depolarization happen, the insidebecome positive and negative outside, keeps the cells depolarized for alonger time because calcium channels open up which helps depolarization,then repolarization happen, potassium channels open up and potassium runs

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Term
Fall
Professor
NoProfessor
Tags
Cardiology, Electrical conduction system of the heart, Cardiac pacemaker

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