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21 Cards in this Set

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Atrium
function primarily as blood reservoirs
Ventricle
Supply the main force for moving blood through the pulmonary and peripheral circulations
Tricuspid Valve
Prevents blood from flowing back in the right atrium during ventricular contraction
Mitral (bicuspid) Valve
Prevents blood from flowing back in the left atrium during ventricular contraction
Aortic Valve
Prevents backflow from the aorta into the ventricles during ventricular relaxation
Pulmonary Valve
Prevents backflow from the pulmonary arteries into the right ventricle during ventricular relaxation
Diastole
Ventricular relaxation
Systole
Ventricular Contraction
Sinoatrial (SA) Node
Where rhythmic electrical impulses are normally initiated
Internodal Pathways
Carry the impulse to the Atrioventricular (AV) node
Atrioventricular (AV) node
Where the impulse is delayed slightly before passing into the ventricles
Atrioventricular (AV) Bundle
Carries the impulse to the ventricles
Left and Right Bundle Branches
Which further divide into the Purkinje fibers and carry impulses to all parts of the ventricles.
Purkinje Fibers
Conducts impulses to all parts of the ventricles
Sympathetic Nervous System
Part of the autonomic nervous system that enables the "fight or flight" response
Parasympathetic Nervous System
Part of the autonomic nervous system that causes the body to relax and also to digest food.
Bradycardia
A resting heart rate fewer than 60 bpm
Tachycardia
A resting heart rate greater than 100 bpm
Electrocardiogram (ECG)
A graphic representation of the electrical activity of the heart.
Depolarization
The reversal of the membrane electrical potential, the negative inside the membrane becomes slightly positive and the positive outside the membrane becomes slightly negative.
Repolarization
A process where the ventricles recover from the state of depolarization.