| A | B |
|---|
| Pericardium | double walled sac enclosing the heart. |
| Myocardium | layer of the heart that actually contracts. |
| Atria | upper two of the four chamber of the heart. |
| Ventricles | bottom two of the four chambers of the heart. |
| Pulmonary Circulation | circulation from the right side of the heart to the lungs and back to the left side of the heart. |
| Aorta | largest artery; carries blood from the left side of the heart out to the body |
| Systemic Circulation | Circulation from the left side of the heart through the body tissues and back to the right side of the heart. |
| Bicuspid Valve | left AV valve. |
| Tricuspid Valve | right AV valve. |
| Chordae Tendinae | white, tendonous chords. |
| Pulmonary Semilunar Valves | Valve at the entrance of the pulmonary trunk from the right ventricle. |
| Aortic Semilunar Valve | Valve guarding the entrance to the aorta from the left ventricle. |
| Sinoatrial Node | Crescent-shaped node of tissue in the right atrium that is the pacemaker |
| Atriovetricular Node | Node at the junction of the atria and ventricles. |
| Bundle of His | Atrioventricular bundle that sends the atrial rhythm to the ventricles |
| Purkinje Fibers | spread within the muscle of the ventricle walls causing them to contract |
| Pacemaker | The SA node. |
| Tachycardia | A rapid heart rate. |
| Bradycardia | A heart rate substantially slower than normal. |
| Systole | Contraction. |
| Diastole | Relaxation. |
| Cardiac Output | The amount of blood pumped out by each side of the heart in one minute. |
| Heart Rate | The number of heart beats occuring within a specific amount of time. |
| Stroke Volume | The volume of blood pumped out by a ventricle with each heartbeat. |
| Arteries | A vessel that carries blood away from the heart. |
| Arterioles | A small artery that feeds the capillaries. |
| Capillary Beds | A mass of capillaries. |
| Venules | A small blood vessel that transfers blood from the capillaries to the veins. |
| Veins | A blood vessel that carries blood to the heart. |
| Tunica Intima | Thin layer of endothelium that lines the interior of blood vessels |
| Tunica Media | The bulky middle coat of blood vessels that is mostly smooth muscle and fibers. |
| Tunica Externa | The outermost layer of blood vessels made of connective tissue |
| Vital Signs | Measurements of arterial pulse, blood pressure, respiratory rate & body temp. |
| Pulse | Pressure wave that is created when the left ventricle contracts |
| Vasoconstriction | Narrowing of the blood vessels. |
| Hypotension | Low blood pressure. |
| Hypertension | High blood pressure. |
| Interstitial Fluid | The liquid inside the space where substances first diffuse from capillaries |
