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Definition
| sequence of events encompassing one complete contration and relaxation of the atria and ventricles of the heart |
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| a general term referring to a small cavity or depression; an air sac in the lungs |
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| the reflexive increase in heart rate after an increase in venous return; due to mechanical and neural factors; also called Bainbridge reflex |
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Term
| atrioventricular (AV) node |
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Definition
| specialized cardiocytes that relay the contractile stimulus to the bundle of His, the bundle branches, the Purkinje fibers, and the ventricular myocardium; located at the boundary between the atria and ventricles |
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| changes in activity that maintain homeostasis in direct response to changes in the local environment; does not require neural or endocrine control |
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Definition
| the reflexive increase in heart rate after an increase in venous return; due to mechanical and neural factors |
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Definition
| the blood volume (in liters) ejected per minute by the left ventricle |
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Definition
| a period (between contractions) of relaxation of the heart during which it fills with blood |
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| the natural pacemaker of the heart; situated in the wall of the right atrium |
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Definition
| a volume of blood ejected by a ventricle during systole |
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Definition
| the contraction phase of heart activity |
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Definition
| the state of being sticky or thick |
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Definition
| the joining of two tubes, usually referring to a connection between two peripheral vessels without an intervening capillary bed |
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Definition
| specialized conducting cells in the interventricular septum that carry the contracting stimulus from the AV node to bundle branches and then to Purkinje fibers |
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Definition
| the vessel that carries blood between the intestinal capillaries and the sinusoids of the liver |
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Definition
| an area of dead cells that results from an interruption of blood flow |
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Definition
| the force of osmotic water movement; the pressure that must be applied to prevent osmosis across a membrane |
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Definition
| the center in the medulla oblongata the center in the medulla oblongata whose stimulation produces vasoconstriction and an elevation of peripheral resistance |
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Definition
| the membranous sac enveloping the heart |
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