Anatomy Heart
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16 terms
Terms | Definitions |
|---|---|
 Pericardium | double-walled sac (visceral + parietal) Outer lining of the heart |
| Myocardium | Layer of the heart which is composed mainly of cardiac muscle and forms bulk of heart. It is the layer that contracts |
| Endocardium | glistening white sheet of endothelium. Located in the inner myocardial surface. Lines the heart chambers + covers the valves |
| Septum | Chamber of heart that separates atria and ventricles |
| Cusps | piece of tissue which creates the valves |
| Cordae tendinae | "heart strings" which anchor cusps to papillary muscles |
| Papillary muscles | prevents valves from opening by swinging backwards (inversion of the valves) |
| Systole | Contraction of the heart. Blood flows out of the heart Semilunar Valves open, AV valves close |
| Diastole | Relaxation of the heart. Blood flows into the heart AV valves open, Semilunar valves close |
| S.A. Node | pacemaker of the heart. Generates the most impulses, most Na+ flowing in |
| AV Node | impulses pause here for a fraction of a second. (.1s) |
| Bundle of His | projects from the AV node. Connects the atria to the ventricles |
| Purkinje fibers | depolarize the contractile cells of both ventricles |
| Electrocardiogram | A graphic record of heart activity |
| P wave | depolarization of the atria. atria contracts. Systole |
| QRS complex | depolarization of ventricles. Late Diastole. ah |
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