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Heart
| Term | Definition |
|---|---|
| Mediastinum | Area of thorasic cage where the heart is located |
| Coronary Sulcus | Horizontal groove of heart |
| Interventricular Sulcus | Vertical groove of heart |
| Atria | Two chambers of the heart above the coronary sulcus |
| Ventricles | Two chambers of the heart below the coronary sulcus |
| Coronary Arteries | Carry oxygen-rich blood to the heart, 1st branches of aorta |
| Two major coronary arteries | Right Coronary and Left Main Coronary |
| Right Coronary Artery | Supplies right inferior |
| Left Main Coronary | Supplies left anterior |
| Circumflex | Supplies left inferior |
| Pericardium | Serous membrane surrounding the heart (attached) and lining the pericardial cavity, reduces friction from pumping of the heart |
| Visceral Pericardium | Part of the pericardium that surrounds the heart |
| Parietal Pericardium | Part of the pericardium that lines the pericardial cavity |
| Pericardial Space | Space between the visceral and parietal pericardium layers |
| Epicardium | Thin, strong, outermost layer of the heart wall, becomes part of the pericardium |
| Myocardium | Second layer of heart wall, cardiac muscle, thickest layer, responsible for contractile activity |
| Endocardium | Innermost layer of heart wall, thinnest layer, coagulant resistant |
| Ischemia | Oxygen starvation of a tissue |
| Infarction | Death of tissue from oxygen starvation |
| Myocardial Infarction | Heart Attack |
| Conduction System | Responsible for heart stimulation |
| Electrical depolarization | Caused by Na+ entry into cell, leads to contraction (stimulated) |
| Electrical repolarization | Caused by K+ loss from cell, responsible for relaxation of cardiac muscle cells |
| Atrioventricular Valves | Valves between the atria and ventricals of the heart |
| Tricuspid | Right atrioventricular valve |
| Bicuspid (Mitral) | Left atrioventricular valve |
| Semilunar Valves | Valves at the bottom of the ventricals of the heart to allow blood to leave the heart |
| Pulmonary Valve | Right semilunar valve |
| Aortic Valve | Left semilunar valve |
| Systole | Contraction of chamber |
| Diastole | Relaxation of chamber |