Nurturing Life Sciences
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#Unit 7. System Physiology – Animal
Contractile cells constitute the majority of atrial & ventricular tissues.
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Conducting cells constitute tissues of the SA node, the atrial internodal tracts, the AV node, the bundle of His, & the Purkinje system.
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Conducting cells are specialized muscle cells which function to rapidly spread action potentials over the entire myocardium.
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The action potential spreads throughout the myocardium in the following sequence: SA node Atrial internodal tracts and atria AV node Bundle of His Purkinje system Ventricles
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Myocardial fibers have a resting membrane potential of approximately –90 mV.