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Anatomy Ch 12
The Heart
| Term | Definition |
|---|---|
| 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
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