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| 3936282894 | vena cava | a large vein carrying deoxygenated blood into the heart. There are two in humans, the inferior vena cava (carrying blood from the lower body) and the superior vena cava (carrying blood from the head, arms, and upper body). | 0 | |
| 3936297087 | right atrium | one of the four chambers of the heart, deoxygenated blood enters this chamber from inferior/superior vena cava | 1 | |
| 3936314930 | right ventricle | one of four chambers chamber within the heart that is responsible for pumping oxygen-depleted blood to the lungs | 2 | |
| 3936338200 | left atrium | one of four chambers primary roles are to act as a holding chamber for blood returning from the lungs and to act as a pump to transport blood to other areas of the heart. | 3 | |
| 3936342360 | left ventricle | one of four chambers receives blood from the left atrium and pumps it out under high pressure through the aorta to the body | 4 | |
| 3936349390 | pulmonary artery | the artery carrying blood from the right ventricle of the heart to the lungs for oxygenation | 5 | |
| 3936352750 | pulmonary vein | a vein carrying oxygenated blood from the lungs to the left atrium of the heart | 6 | |
| 3936361224 | tricuspid valve | stands between the right atrium and the right ventricle, and it allows blood to flow only from the atrium into the ventricle three flaps | 7 | |
| 3936372269 | bicuspid/mitral valve | permits blood to flow from the left atrium into the left ventricle, but not in the reverse direction two flaps | 8 | |
| 3936447922 | pulmonary valve aka semilunar valve | stands at the opening from the right ventricle in the pulmonary artery trunk moves blood toward the lungs and keeps it from sloshing back from the pulmonary artery into the heart | 9 | |
| 3936464398 | aortic valve | situated at exit of the left ventricle of the heart where the aorta (the largest of all arteries) begins lets blood from the left ventricle be pumped up (ejected) into the aorta but prevents blood once it is in the aorta from returning to the heart | 10 | |
| 3936492891 | aorta | largest artery in the body, that runs down through the chest and the abdomen oxygenated/oxygen rich | 11 | |
| 3936502469 | SA node aka sinoatrial node | heart's natural pacemaker consists of a cluster of cells that are situated in the upper part of the wall of the right atrium (the right upper chamber of the heart). The electrical impulses are generated there | 12 | |
| 3936530760 | av node | controls the heart rate serves as an electrical relay station, slowing the electrical current sent by the sinoatrial (SA) node before the signal is permitted to pass down through to the ventricles | 13 | |
| 3936547310 | coronary artery | vessels that supply the heart muscle with blood rich in oxygen called the coronary arteries because they encircle the heart in the manner of a crown | 14 | |
| 3936629508 | endocardium | the thin, smooth membrane that lines the inside of the chambers of the heart and forms the surface of the valves inner lining of the heart | 15 | |
| 3936632131 | myocardium | the muscular tissue of the heart middle and thickest layer of the heart wall, composed of cardiac muscle | 16 | |
| 3936637539 | pericardium | the membrane enclosing the heart, consisting of an outer fibrous layer and an inner double layer of serous membrane outer coat (the parietal pericardium) is tough and thickened, loosely cloaks the heart, and is attached to the central part of the diaphragm and the back of the breastbone | 17 | |
| 3936654820 | oxygenated | filled with oxygen from the lungs | 18 | |
| 3936654821 | deoxygenated | has had most of its oxygen removed and is returning to the lungs, ready to become reoxygenated | 19 | |
| 3936661312 | artery | vessel that carries blood high in oxygen content away from the heart to the farthest reaches of the body | 20 | |
| 3936668328 | arteriole | A small branch of an artery that leads to a capillary | 21 | |
| 3936672477 | vein | blood vessel that carries blood that is low in oxygen content from the body back to the heart | 22 | |
| 3936676935 | venule | a small vein collecting blood from capillaries | 23 | |
| 3936686658 | capillary | a tiny blood vessel that connects an arteriole (the smallest division of an artery) with a venule (the smallest division of a vein) | 24 | |
| 3936690472 | iron | necessary for the transport of oxygen (via hemoglobin in red blood cells) and for oxidation by cells (via cytochrome) | 25 | |
| 3936705722 | red blood cell | blood cells that carry oxygen. Red cells contain hemoglobin and it is the hemoglobin which permits them to transport oxygen (and carbon dioxide) | 26 | |
| 3936800823 | hemoglobin | a red protein responsible for transporting oxygen in the blood of vertebrates | 27 | |
| 3936884288 | platelet | irregular, disc-shaped element in the blood that assists in blood clotting | 28 | |
| 3936884289 | smooth muscle | generally forms the supporting tissue of blood vessels and hollow internal organs, such as the stomach, intestine, and bladder | 29 | |
| 3936893658 | cardiac muscle | found only in the heart responsible for pumping blood throughout the body | 30 | |
| 3936899970 | systolic pressure | in blood pressure reading typically the first number recorded. For example, with a blood pressure of 120/80 ("120 over 80"), the systolic pressure is 120. By "120" is meant 120 mm Hg (millimeters of mercury) | 31 | |
| 3936909692 | diastolic pressure | specifically the minimum arterial pressure during relaxation and dilatation of the ventricles of the heart when the ventricles fill with blood typically the second number recorded | 32 | |
| 3936914373 | aneurism | an excessive localized enlargement of an artery caused by a weakening of the artery wall | 33 | |
| 3936924957 | stroke | occurs when the blood supply to part of your brain is interrupted or severely reduced, depriving brain tissue of oxygen and nutrients lack of oxygen, caused by blockage of blood flow or rupture of an artery to the brain | 34 | |
| 3936928403 | heart attack (myocardial infarction) | death of heart muscle due to the loss of blood supply the loss of blood supply is usually caused by a complete blockage of a coronary artery, one of the arteries that supplies blood to the heart muscle | 35 | |
| 3936952631 | Atherosclerosis | the buildup of fats, cholesterol and other substances in and on your artery walls (plaques), which can restrict blood flow | 36 |
