click below
click below
Normal Size Small Size show me how
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 |