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18 questions
A small mass of specialized tissue located in the right atrium of the heart that acts like the pacemaker of the heart. (Area #1)
sinoatrial node (SA node)
atrioventricular node (AV node)
purkinje fibers
bundle of His
A small mass of tissues that transmit impulses received from the sinoatrial node to the ventricles via the bundle of His (Area #2)
sinoatrial node (SA node)
atrioventricular node (AV node)
purkinje fibers
bundle of His
Pressure sensitive nerve endings in the atrium, aortic arch and carotid artery, they send information back to the cardiac center stimulating either the sympathetic or parasympathetic branches to regulate heart rate.
sinoatrial node (SA node)
atrioventricular node (AV node)
purkinje fibers
baroreceptors
A slender bundle of cardiac muscle that conducts electrical impulses from the AV node to the left and right bundle branches to the purkinje fibers in the ventricle. (Area #6)
purkinje fibers
left bundle branches
bundle of His
sinoatrial node (SA node)
The left limbs or branches through which electrical impulses are transmitted from the bundle of His through the left ventricle. (Area #4)
left bundle branches
right bundle branches
purkinje fibers
bundle of His
Electrical impulses from the bundle of His are transmitted through the right ventricle through this... (Area #4)
left bundle branches
right bundle branches
purkinje fibers
bundle of His
Part of the impulse conducting network of the heart that rapidly transmits impulses through the ventricles causing ventricular contraction. (Area #3)
left bundle branches
right bundle branches
purkinje fibers
bundle of His
To contract the atriums and ventricles, they do this as the heart beats...
polarize
depolarize
repolarize
ventriculate
To relax, the atrium and ventricles do this as the heart beats.
polarize
repolarize
depolarize
ventriculate
A irregular heartbeat or rhythm.
polarization
depolarization
arrhythmia
fibrillation
A normal heart rhythm but with a rate below 60bpm. This condition is common with athletes.
tachycardia
bradycardia
atrial fibrillation
heart block
A normal heart rhythm but with a rate above 100bpm.
tachycardia
bradycardia
premature atrial contraction (PAC)
premature ventricular contraction (PVC)
a condition in which a irritable piece of atrial heart tissue fires before the SA node. This causes the contraction to occur too early in the rhythm. Usually they are harmless, caffeine and other stimulants can increase their likelihood.
tachycardia
bradycardia
premature atrial contractions (PAC)
premature ventricular contractions (PVC)
A condition in which the atrial tissue is very irritated, causing the atria to beat at a rate greater than 350bpm. The atria don’t beat in a coordinated manner, they simply quiver. On the ECG it is represented as a wavy line and the rhythm is irregular.
premature atrial contraction (PAC)
arrhythmia
premature ventricular contraction (PVC)
atrial fibrillation
A condition in which Purkinje fibers fire before the SA node, causing the ventricles to contract prematurely.
premature atrial contractions
arrhythmia
premature ventricular contractions
atrial fibrillation
A life threatening arrhythmia in which the ventricles, rather than the SA node initiate the beat. The heart rate is between 150 and 250 bmp, requiring immediate medical intervention
bradycardia
premature atrial contraction (PAC)
ventricular tachycardia
atrial fibrillation
A life threatening condition in which the ventricles quiver at a rate greater than 350bpm. Essentially there is no cardiac output. Defibrillation is needed to re-start the heart in the hope it regains its normal rhythm.
bradycardia
ventricular fibrillation
premature ventricular contraction (PVC)
tachycardia
A condition in which the impulses traveling from the SA node to the ventricles are delayed, or blocked intermittently, or completely blocked by the AV node.
bradycardia
tachycardia
heart block
ventricular fibrillation
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