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| upper chamber of each half of the heart |
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| either of the two lower chambers on each side of the heart that receive blood from the atria and in turn force it into the arteries. |
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| the muscular substance of the heart. |
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| a blood vessel that conveys blood from the heart to any part of the body. |
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| one of the system of branching vessels or tubes conveying blood from various parts of the body to the heart. |
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| one of the minute blood vessels between the terminations of the arteries and the beginnings of the veins. |
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| the oxygen-carrying pigment of red blood cells that gives them their red color and serves to convey oxygen to the tissues |
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| refers to the movement of blood through the tissues of the heart |
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Definition
1. begins with the right ventricle, which pumps deoxygenated blood through the pulmonary artery.
2.This artery divides above the heart into two branches, to the right and left lungs, where the arteries further subdivide into smaller and smaller branches until the capillaries in the aveoli are reached.
3. In the capillaries the blood takes up oxygen from the air breathed into the air sacs and releases carbon dioxide.
4.It then flows into larger vessels until the pulmonary veins are reached.
5. The pulmonary veins open into the left atrium of the heart. |
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| refers to blood flow that reaches the upper and lower extremities of the body and the surface of the skin |
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| constriction of the blood vessels, as by the action of a nerve. |
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Term
| conduction system of the heart |
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Definition
| consists of cardiac muscle cells and conducting fibers that are specialized for initiating impulses and conducting them rapidly through the heart |
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| "natural" cardiac pacemaker |
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Definition
| The electrical impulse from the SA node triggers a sequence of electrical events in the heart to control the orderly |
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Definition
| reversal of the resting potential in excitable cell membranes when stimulated |
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Definition
| whereby the membrane, cell, or fiber, after depolarization, is polarized again, with positive charges on the outer and negative charges on the inner surface. |
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| a deflection in the electrocardiogram produced by excitation of the atria. |
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| the portion of the electrocardiogram between the onset of the P wave (atrial depolarization) and the QRS complex (ventricular depolarization). |
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| a series of waveforms on an electrocardiogram that represents both normal and abnormal depolarization of ventricular muscle cells |
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Definition
| the deflection of the normal electrocardiogram following the QRS complex; it represents repolarization or recovery of the ventricles. |
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| the interval from the end of ventricular depolarization to the onset of the T wave. |
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| a potential undulation of unknown origin immediately following the T wave and often concealed by it; seen in the normal electrocardiogram and accentuated in tachyarrhythmias and electrolyte disturbances. |
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