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