Term
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Definition
| area above the diaphragm and between the lungs where the heart lies |
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Term
| superior and inferior venae cavae |
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Definition
| right heart receives venous blood from the systemic circulation through these vessels |
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Term
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Definition
| blood leave teh right ventricle and enters the pulmonary circulation through these vessels |
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Term
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Definition
| these vessels carry oxygenated blood from the lungs to the left side of the heart |
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Term
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Definition
| delivers blood to systemic vessels that supply the body |
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Term
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Definition
| period of the cardiac cycle in which blood fills the ventricles |
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Term
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Definition
| the contraction of the heart in which blood is propelled out of the ventricles and into the circulation |
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Term
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Definition
| consists of one contraction and relaxation |
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Term
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Definition
| branch of the systemic circulation that supplies the heart |
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Term
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Definition
| specialized cells that enable the myocardium to generate and transmit action potentials without stimulation from the nervous system |
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Term
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Definition
| electrical activation of the muscle cells caused by the movement of electrically charged solutes (ions) across cardiac cell membranes |
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Term
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Definition
| period in which no new cardiac action potentials can be initiated by a stimulus; follows depolarization |
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Term
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Definition
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Term
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Definition
| represents atrial depolarization on a ECG |
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Term
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Definition
| represents ventricular depolarization and atrial repolarization on an ECG |
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Term
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Definition
| represents ventricular repolarization on an ECG |
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Term
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Definition
| property of generating spontaneous depolarization to threshold (ability to spontaneously depolarize); enables the SA and AV nodes to generate cardiac APs without a stimulus |
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Term
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Definition
| cells capable of spontaneous depolarization |
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Term
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Definition
| regular generation of an AP by the heart's conduction system; the pace is set by the SA node |
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| enhance myocardial performance by stimulating the SA node to increase the heart rate |
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Term
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Definition
| affect heart work through the vagus nerve; causes decreased heart rate and slows conduction through the AV node |
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Term
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Definition
| amount of blood moved per unit of time; measure in mL/min |
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Term
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Definition
| force exerted on a liquid per unit area |
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Term
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Definition
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Term
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Definition
| greater resistance decreases or increases blood flow? |
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Term
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Definition
| the thicker the blood, the faster?/slower? it moves?? |
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Term
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Definition
| the smaller the diameter, the __________ blood flow |
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Term
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Definition
| as length increases, resistance __________ |
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Term
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Definition
| distance blood travels in a unit of time (cm/sec) |
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Term
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Definition
| normal blood flow through vessels |
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Term
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Definition
| when blood flow is obstructed, the vessel turns or blood flows over rough surfaces and blood flow becomes _____________ |
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Term
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Definition
| the increase in volume a vessel can accomodate for a given increase in pressure; veins accommodate increases in volume better than arteries |
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Term
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Definition
| stretch receptors in the aorta and carotid sinus--respond to changes in smooth muscle fiber length by altering their rate of discharge and supply sensory info to the cardiovascular center that regulates blood pressure |
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Term
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Definition
| important in the control of respiration but also transmit impulses to the medullary cardiovascular centers that regulate blood pressure |
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Term
| total peripheral resistance |
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Definition
| total resistance in systemic circulation |
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Term
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Definition
| speacial vascular system that picks up excess interstitial fluid and returns it to the bloodstream; follows the venous system throughout the body; consists of vessels and nodes |
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