| A | B |
|---|
| muscle layer of the heart | myocardium |
| sac that encloses the heart | pericardium |
| thickest chamber of the heart | left ventricle |
| side of the heart receiving deoxygenated blood | right |
| side of the heart receiving oxygenated blood | left |
| attach the cusps of the atrioventricular valves to the ventricle wall | chordae tendonae |
| supply the heart muscle with oxygenated blood | coronary arteries |
| chest pain | angina pectoris |
| heart attck | myocardial infarction |
| pacemaker | sinoatrial node |
| carries impulse to bottom of the heart | Bundle of His |
| carries impulses that cause ventricles to contract | Purkinje fibers |
| on an EKG, indicates impulse spread through atria | P wave |
| on an EKG, indicates impulse spread through ventricles | QRS wave |
| on an EKG, indicates ventricular contraction | T wave |
| contraction of a heart chamber | systole |
| relaxation of a heart chamber | diastole |
| causes the "lupp" sound of a heartbeat | closing of atrioventricular valve |
| causes the "dubb" sound of a heartbeat | closing of semilunar valves |
| determined by stroke volume and beats per minute; amount of blood ejected from left ventricle to the aorta per minute | cardiac output |
| risks for heart disease | smoking, obesity, lack of exercise |
| atriole systole-ventricle diastole folled by atrial diastole-ventricle systole | cardiac cycle |
| contraction of a heart chamber | systole |
| relaxation of a heart chamber | diastole |
| indicated by the P wave on an EKG | ventricular systole |
| sound heard from cuspid valves closing | lubb |
| sound heard from semilunar valves closing | dupp |
| amount of blood ejected by a ventricle during each contraction | stroke volume |
| the more cardiac fibers are stretched by the filling of a chamber with blood, the stronger the walls will contract | Starling's Law |
| area of the brain which controls heart rate | medulla |
| nerve endings that detect changes in blood pressure | baroreeceptors |
| factors that increase heart rate | anger, fear, female gender |
| factors that decrease heart rate | cold, old age, high blood pressure |
| caused by artherosclerosis or coronary artery spasm | coronary artery disease |
