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| Baroceptor: Specialized pressure sensors in the aortic arch and carotid arteries. They are sensitive to changes in arterial pressure, which sends signs to respond to changes in blood pressure. |
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| End-systolic volume. The amount of blood still in the ventricle after the contraction. Typically about 40 ml under resting conditions. |
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| A group of specialized fibers in the upper posterior wall of the right atrium that initiates the impulse for a normal heart contraction. |
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| The volume of blood pumped during one contraction or beat of the heart. |
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| Helps regulate blood flow through small changes involving restricting the blood vessel's radius. |
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| Helps regulate blood flow through small changes involving widening the blood vessel's radius. |
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| The collective name for the cardiac or myocardial muscle. Its thickness varies based on the amount of stress it regularly deals with. |
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| Composed of a globin and pigment, (globin and heme), the latter of which binds oxygen. It transports oxygen through the body. Each blood cell contains about 250 million. |
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| The percentage of the total blood volume composed of cells or formed elements. |
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| End-diastolic volume. The volume of blood in the ventricle at the end of diastole, just before contraction. |
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