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| Blood cell formation, synthasized in the bone marrow. |
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| cells and cell fragments including RBC's, WBC's, and platelets suspended in the plasma of the blood. |
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| Major component of RBC's composed of 4 globin peptides bound to a heme group, each bound to a oxygen molecule. Reversibly binds to Oxygen. Makes up 33% of RBC's. |
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| Hormone that is secreted by the kidney that attaches to immature erythrocytes. Stimulates their production. |
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| Soluble plasma protein precursor of fibrin, involved with forming the framework for clots. Traps blood, platelets, and fluid from leaving the body. |
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| Controls the opening from the left ventricle to the aorta. Contraction of the left ventricle forces it open |
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| Regulate the opening between the atria and the ventricles. Right has 3 cusps and the left has 2. Opens in response to pressure changes |
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| A patch of modified cardiocytes in the right atrium, acts as the pacemaker and initiates each heartbeat and determines the heart rate. |
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| Located near right atrioventricular valve, acts as an electrical gateway to the ventricles. |
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Definition
| Allow ions to flow from cytoplasm of one cardiocyte directly into the next. Enables direct stimulation from its neighbors. |
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Definition
| Initiate action potentials in the heary without a stimulus. Unstable resting potentials called pacemaker potentials. Propogate to other cardiac cells, stimulating them to contract |
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| AR cells spread APs to other muscle cells, causing them to contract. This leads to the systole action. |
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| Anything that regulates the heartrate. Usually found in the SA node. If not, artificial one can placed in the body via electrodes. |
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Definition
| Contraction of the specific part of the heart |
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Definition
| Relaxation of a particular portion of the heart |
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Definition
| The amount of tension in the ventricular myocardium immediately before it begins to contract. Stretch increases this. |
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Definition
| The blood pressure in the aorta and pulmonary trunk immediately distal to the semilunar valves. |
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| End diastolic Volume. Volume at the end of a the diastole in a fully relaxed ventricle |
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| Amount of blood left in the ventricle after contraction. |
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| End Diastolic Volume- End Systolic Volume. How much blood is being pumped through the body in a single beat. |
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| The amount of blood ejected by each ventricle in 1 minute. Calculated using heart rate x Stroke volume |
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Definition
| How many times a heart beats per minute (average 75). |
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Definition
| The blood from the body that returns to the atrium. |
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