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Anatomy Ch 12

The Heart

TermDefinition
aorta the largest artery of the body
atrium one of the two upper chambers of the heart that receive venous blood from the lungs or the body
cardiac cycle the sequence of events in one heartbeat, in which simultaneous contraction of the atria is followed by simultaneous contraction of the ventricles
cardiac output the amount of blood pumped by a ventricle in one minute
coronary arteries the blood vessels that circulate blood throughout the myocardium
diastole in the cardiac cycle, the relaxation of the myocardium
endocardium the simple squamous epithelial tissue that lines the chambers of the heart and covers the valves
epicardium the serous membrane on the surface of the myocardium
mediastinum the area or space between the lungs
mitral valve the left atrioventricular valve, which prevents backflow of blood from the left ventricle to the left atrium when the ventricle contracts
myocardium the cardiac muscle tissue that forms the walls of the chambers of the heart
sinoatrial node the first part of the atrial conduction pathway, located in the wall of the right atrium
stroke volume the amount of blood pumped by a ventricle in one beat
systole in the cardiac cycle, the contraction of the myocardium
tricuspid valve the right AV valve, which prevents backflow of blood from the right ventricle to the right atrium when the ventricle contracts
venous return the amount of blood returned by the veins to the heart
ventricle one of the two lower chambers of the heart that pump blood to the body or to the lungs
arrhythmia an abnormal or irregular rhythm of the heart
ectopic focus the initiation of a heartbeat by part of the myocardium other than the sinoatrial node
ejection fraction the percent of blood in a ventricle that is pumped during systole
electrocardiogram a recording of the electrical changes that accompany the cardiac cycle
filibration very rapid and uncoordinated heartbeats
heart murmur an abnormal heart sound heard during the cardiac cycle
ischemic lack of blood to a body part, often due to an obstruction of circulation
myocardial infarction death of part of the heart muscle due to lack of oxygen
pulse the force of the heartbeat detected at an arterial site such as the radial artery
stenosis an abnormal constriction or narrowing of an opening or a duct
Created by: Beina