| A | B |
|---|
| lubb | sound created by closing of AV valves |
| dup | sound created by closing of semilunar valves |
| 1st phase of cardiac cycle | atrial systole |
| 2nd phase of cardiac cycle | ventricular systole |
| 3rd phase of cardiac cycle | all chambers in diastole |
| systole | contraction phase |
| diastole | relaxation phase |
| sino-atrial node | pacemaker of heart |
| A-V node | secondary pacemaker; relay station |
| AV Bundle | Relays electrical message down the septum |
| Purkinje fibers | relays electrical impulse over the walls of the ventricles |
| electrocardiogram | tracing of electrical activity moving through the heart |
| P wave | signifies depolarization of the atria |
| QRS complex | depolarization of the ventricles |
| T wave | repolarization of the ventricles |
| cardiac output | heart rate X stroke volume |
| stroke volume | amount of blood pumped by left ventricle each beat |
| sympathetic nerves | stimulate the heart to increase its rate |
| parasympathetic nerves | inhibit the heart to decrease rate |
| Starlings law of heart | explains increase in stroke volume with exercise |
| arteries | carry blood away from the heart |
| veins | carry blood toward the heart |
| capillaries | smallest blood vessels where exchange of gases and nutrients occurs |
| arterioles | small arteries |
| venules | small veins |
| systolic pressure | upper number in BP reading |
| diastolic pressure | lower number in BP reading |
| CPR | cardio-pulmonary resuscitation |
| hypertension | high blood pressure |
| heart murmur | unusual heart sounds |
| coronary atherosclerosis | buildup of plaque in coronary arteries |
| coronary thrombosis | clot in a coronary artery |
