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sinoatrial node

where electrical impulse starts; natural pacemaker

conduction system

controls the heart beat

P wave

contraction of the atria

QRS complex

electrical wave that shows the contraction of the ventricles

T wave

a wave on the cardiac cycle that indicates ventricular relaxation

bundle of His

bundle of fibers that goes along the septum to the apex

atrioventricular node

bundle of electrical fibers where electrical signals are sent then relayed to the Bundle of His

natural pacemaker

SA node

purkinje fibers

causes ventricles to contract


picture of the electrical system of the heart

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