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| 4882944151 | Closed circulatory system | Blood is confined to vessels and separate from interstitial fluid | 0 | |
| 4882988439 | Capillary beds | Networks of capilaries where chemical exchange between the blood and the interstitial fluid occurs | 1 | |
| 4883023733 | Cardiac cycle | Rhythmic contraction and relaxation of the heart | 2 | |
| 4883028346 | Sytole | contraction of the heart | 3 | |
| 4883030081 | Diastole | Relaxation of the heart | 4 | |
| 4883032072 | Stroke volume | The amount of blood ejected from the heart in one contraction. | 5 | |
| 4883036291 | Cardiac output | The volume of blood pumped per minute (This depends on both heart rate and stroke volume) | 6 | |
| 4883059130 | Atrioventricular valves | Valves that separate each ventricle and atrium and prevent back flow of blood | 7 | |
| 4883078432 | Semilunar Valves | Controls blood flow to the aorta and the pulmonary artery | 8 | |
| 4883084421 | Heart murmur | The back flow of blood through a defective valve | 9 | |
| 4883090390 | Sinoatrial node | The "pacemaker," This sets the rate and timing at which cardiac muscle cells contract | 10 | |
| 4883099300 | Atrioventricular node | The impulses from the SA node travel here and then to the heart cells | 11 | |
| 4883110170 | Electrocardiogram | A machine that records the impulses that travel during the cardiac cycle | 12 | |
| 4883118031 | Endothelium | The epithelial layer that lines blood vessels | 13 | |
| 4883130563 | Pulse | The rhythmic bulging of artery walls with each heart beat | 14 | |
| 4883134584 | Systolic pressure | The pressure in the arteries during ventricular systole (It is the highest pressure in the arteries) | 15 | |
| 4883144093 | Diastolic pressure | The pressure in the arteries during diastole (It is lower than systolic pressure) | 16 | |
| 4883151687 | Vasoconstriction | The contraction of smooth muscle in arteriole walls (Increases blood pressure) | 17 | |
| 4883158467 | Vasodilation | The relaxation of smooth muscles in the arterioles (Decreases blood pressure) | 18 | |
| 4883166473 | Endothelin | A peptide that is an important inducer in vasoconstriction | 19 | |
| 4883175397 | 120mmHg | The blood pressure for a healthy 20 year old at sytole | 20 | |
| 4883181020 | 70mmHg | The blood pressure for a healthy 20 year old at diastole | 21 | |
| 4883185859 | Fainting | Caused by inadequate blood flow to the head | 22 | |
| 4883198984 | Lymphatic system | Returns fluid that leaks out in the capillary beds | 23 | |
| 4883204639 | Lymph | Fluid that reenters the circulation directly at the venous end of the capillary bed and indirectly through the lymphatic system | 24 | |
| 4883217063 | Lymph nodes | Organs that filter lymph and play an important role in the body's defense | 25 | |
| 4883221145 | Edema | Swelling caused by distributions in the flow of lymph | 26 | |
| 4883226424 | Plasma | A liquid matrix that suspends the several kinds of cells that make up blood (It is 90% water) | 27 | |
| 4883235816 | Platelets | A third cellular element are fragment cells that are involved in clotting | 28 | |
| 4883242882 | Erythrocytes | Red blood cells (These are the most numerous blood cells) | 29 | |
| 4883250093 | Hemoglobin | The iron containing protein that transports oxygen | 30 | |
| 4883251631 | Leukocytes | White blood cells, There are 5 kinds: Monocytes, Neutrophils, Basophils, Eosinophils, and Lymphocytes | 31 | |
| 4883274171 | Fibrin | The converted form of fibrinogen by a cascade of complex reactions to form a clot | 32 | |
| 4883284962 | Thrombus | A blood clot that is formed within a blood vessel | 33 | |
| 4883291933 | Erythropoietin | A hormone that erythrocytes produce when oxygen delivery is low | 34 | |
| 4883298599 | Stem cells | The source that is common within the production of Erythrocytes, Leukocytes, and Platelets | 35 | |
| 4883317804 | Atherosclerosis | A cardiovascular disease caused by the build up of plaque deposits within arteries | 36 | |
| 4883321173 | Heart attack | The death of cardiac muscle tissue resulting from the blockage of one or more coronary arteries | 37 | |
| 4883326949 | Stroke | The death of nervous tissue in the brain due to the rupture or blockage of arteries in the head | 38 | |
| 4883337694 | Low-density Lipoproteins | "Bad Cholesterol" These are associated with plaque formation | 39 | |
| 4883343112 | High-density Lipoproteins | "Good Cholesterol" These help lower the deposition of cholesterol | 40 | |
| 4883352041 | Gas exchange | Supplies oxygen for cellular respiration and disposes of carbon dioxide | 41 | |
| 4883355831 | Hypertension | High blood pressure that promotes atherosclerosis and increases the chance of heart attack and stroke | 42 | |
| 4883361844 | Partial pressure | The pressure exerted by particular gas in a mixture of gases | 43 | |
| 4884538680 | Ventilation | Moves the respiratory medium over the respiratory surface | 44 | |
| 4884544859 | Countercurrent exchange | Blood flows in the opposite direction of the water passing over the gills | 45 | |
| 4884547830 | Surfactants | Secretions that cover the alveoli | 46 | |
| 4884570071 | Breathing control centers | Occurs in the medulla oblongata and the pons | 47 | |
| 4884578266 | Negative pressure breathing | Breathing by pulling air into the lungs | 48 | |
| 4884582614 | Tidal volume | The volume of air inhaled with each breath | 49 | |
| 4884585554 | Vital capacity | The maximum tidal volume | 50 | |
| 4884591906 | Residual volume | The amount of air left in the lungs after exhaling | 51 | |
| 4884598825 | Respiratory pigment | Proteins that transport oxygen (these greatly increase the amount of oxygen the blood can carry) | 52 | |
| 4884607857 | Bohr shift | CO₂ produced during cellular respiration lowers blood pH and decreases the affinity of hemoglobin for O₂ | 53 | |
| 4884621173 | Myoglobin proteins | Proteins that can store oxygen | 54 | |
| 4898185218 | Right atrium | What is indicated by the yellow arrow |  | 55 |
| 4898250789 | Right ventricle | What is indicated by the yellow arrow |  | 56 |
| 4898288771 | Left atrium | What is indicated by the yellow arrow |  | 57 |
| 4898303538 | Left ventricle | What is indicated by the yellow arrow |  | 58 |
