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4.2 Key Terms (Heart Rate (A measure of cardiac activity usually expressed…
4.2 Key Terms
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Purkinje Fibers
release a neurotransmitter called GABA (gamma-aminobutyric acid), which exerts inhibitory actions on certain neurons and thereby reduces the transmission of nerve impulses.
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Pulse
The rhythmic expansion and recoil of arteries resulting from heart contraction; can be felt from the outside of the body.
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Blood Pressure
Pressure exerted by the blood upon the walls of the blood vessels, especially arteries, usually measured by means of a sphygmomanometer and expressed in millimeters of mercury.
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Sinoatrial (SA) Node
A small mass of tissue that is made up of Purkinje fibers, ganglion cells, and nerve fibers, that is embedded in the musculature of the right atrium, and that originates the impulses stimulating the heartbeat -- called also S-A node, sinus node.
Myocardial Infarction
Heart Attack
An acute episode of heart disease marked by death or damage of heart muscle due to insufficient blood supply to the heart muscle usually as a result of coronary thrombosis or a coronary occlusion and that is characterized especially by chest pain.
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Pacemaker
An electrical device for stimulating or steadying the heartbeat or reestablishing the rhythm of an arrested heart.