Anatomy
The two upper chambers of the heart
What are the atria?
The node that discharges impulses at a rate of 60-100 times per minute
What is the SA node?
An electrical event that results in myocardial contraction
What is depolarization?
Receives blood from the rest of the body via superior and inferior vena cava
What is the right atrium?
The two lower chambers of the heart
What are the ventricles?
Pacemaker cells generate impulse at a rate of 30-40 times per minute
What is ventricular back-up?
The ability of cardiac cells to conduct an electrical impulse
What is conductivity?
Ejects blood to the body via the aorta
What is the left ventricle?
Valve between the right atrium and right ventricle
What is the tricuspid valve?
Conduct electrical impulses to the right and left ventricles
What are the bundle branches?
The ability of cardiac cells to cause myocardial contraction
What is contractility?
Receives oxygenated blood from the lungs
What is the left atrium?
Valve between the left atrium and left ventricle
What is the mitral (bicuspid) valve?
Node that generates impulses at 40-60 times per minute
What is the AV node?
An electrical event that leaves the cardiac cells ready to be stimulated again
What is repolarization?
Ejects blood into the lungs to be oxygenated
What is the right ventricle?
Valve between the left ventricle and the aorta
What is the aortic valve?
The ability of the pacemaker cells to generate their own electrical impulses spontaneously
What is automaticity?
The ability of cardiac cells to respond to an electrical impulse
What is excitability?
Prevents the backflow of blood into the atria
What are the AV valves?