Test 2 Flashcards
This term describes the pressure exerted on the ventricle wall by the “load” or volume of blood in the ventricles just before ventricular contraction.
Preload
This term describes the special cardiac cells that quickly pass along a depolarization wave throughout the heart, resulting in a coordinated contraction.
Conduction Cell
This is the property that describes the ability of certain heart cells to depolarize spontaneously on their own.
Automaticity
This is the pacemaker of the heart
Sinoatrial Node (SA node)
This term is the part of the ECG that represents atrial depolarization.
P wave
This is the specialized structure through which depolarization waves in the atria must pass to get to the ventricles; it delays the depolarization wave as it passes.
Atrioventricular Node (AV Node)
That part of the ECG that represents movement of the depolarization wave through the AV node.
P R Interval or PQRS
This is the part of the ECG that represents ventricular depolarization.
Q R S Complex
This is the part of the ECG that represents ventricular repolarization.
T wave
When a cardiac cell is in the resting, polarized state, this ion is mostly concentrated on the inside of the cell.
Potassium
This ion rushes into the cardiac cell to initiate depolarization
Sodium
This is the specialized pump that maintains concentrations of sodium and potassium in their respective locations during the polarized resting state.
Sodium - Potassium ATPase
The influx of what ion produces the plateau phase of cardiac muscle cell depolarization?
Calcium
This is any abnormal or irregular heart rhythm.
Arrhythmia
These are the two catecholamines released by the sympathetic nervous system that produce its effects.
Epinephrine and norepinephrine
Stimulation of this receptor increases heart rate.
Beta 1
Stimulation of this receptor slows heart rate.
Cholinergic
Stimulation of this receptor causes bronchodilation.
Beta 2
Stimulation of this receptor causes increased GI activity.
Cholinergic
Stimulation of this receptor causes peripheral vasoconstriction.
Alpha 1
This term means a fast heart rate. Slow heart rate?
Tachycardia - fast
Bradycardia - slow
This is a site of depolarization in the heart that is other than on the normal conduction pathway sequence (SA node, AV node).
Ectopic focus
Large, bizarre-looking wave on the ECG caused by some cell in the ventricles depolarizing on its own out of sequence and disrupting normal ventricular depolarization.
Premature ventricular contraction
Abnormality seen on ECG as a prolongation of the PR interval, representing decreased conduction of the depolarization wave through the atrioventricular (AV) node.
First degree AV block