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BIO 420 Mammalian Physiology
Warner Pacific College
Fall 2015
Ch. 10-11, 13: The Cardiovascular System – Electrical Conduction
I. Autorhythmic Cells
Non-contractile
Unstable resting potential
Spontaneous depolarization
II. Electrical Conduction System
Sinoatrial (SA) node
Atrioventricular (AV) node
AV bundle
Bundle branches
Purkinje fibers
Conduction rates
III. Electrocardiogram
A. Normal ECG waves
P wave
QRS complex
T wave
B. Ventricular depolarization vs. ECG potentials
C. Current flow around the heart during cardiac cycle
IV. Cardiac Arrhythmias
A. Abnormal sinus rhythms
Tachycardia
Bradycardia
B. Conduction system blockage
SA block
AV block
First degree
Second degree
Third degree
C. Ventricular fibrillation
Defibrillation
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