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11.2 Anatomy Vocab

TermDefinition
arrhythmia an irregular heartbeat or rhythm
atrial fibrillation condition in which the atria contract in an uncoordinated, rapid manner (rate above 350 BPM), causing the ventricles to contract irregularly
atrioventricular node (AV node) a small mass of tissue that transmits impulses received from the sinoatrial node to the ventricles via the bundle of HIS
baroreceptors pressure sensitive nerve endings in the atrium, aortic arch, and cartoid arteries
bradycardia a normal heart rhythm but with a rate below 60 BPM; a condition common among athletes
bundle of His a slender bundle of modified cardiac muscle that conducts electrical impulses from the AV node to the left and right bundle branches to the Purkinje fibers in the ventricle
depolarize to contract; the atria and ventricles depolarize as the heart beats
heart block a condition in which the impulses traveling from the SA node to the ventricles are delayed, intermittently blocked, or completely blocked by the AV node
left bundle branches the left limbs or branches through which electrical impulses are transmitted from the bundle of His through the left ventricle
premature atrial contractions condition in which an irritable piece of atrial heart tissue fires before the SA node, causing the atria to contract too soon
premature ventricular contractions condition in which Purkinje fibers fire before the SA node, causing the ventricles to contract prematurely
Purkinje fibers part of the impulse conducting network of the heart that rapidly transmits impulses throughout the ventricles, causing ventricular contraction
repolarize to relax;the atria and ventricles repolarize as the heart beats
right bundle branches the right leg or branch through which electrical impulses are transmitted from the bundle of His through the right ventricle
sinoatrial node (SA node) a small mass of specialized tissue located in the right atrium that normally acts as the pacemaker of the heart, causing it to beat at a rate between 60 and 100 bpm
tachycardia a normal heart rhythm but with a rate above 100 bpm
ventricular fibrillation a life threatening condition in which the heart ventricles quiver at a rate greater than 350 bpm
ventricular tachycardia a life threatening arrhythmia in which the ventricles, rather than the SA node, initiate the heartbeat; the heart rate is between 150 and 250 bpm, requiring swift medical attention
Created by: espindan1
 

 



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