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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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Pulse
The rhythmic expansion and recoil of arteries resulting from heart contraction; can be felt from the outside of the body.
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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Pacemaker
An electrical device for stimulating or steadying the heartbeat or reestablishing the rhythm of an arrested heart.
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Myocardial Infarction
Commonly known as a heart attack, occurs when blood flow decreases or stops to a part of the heart, causing damage to the heart muscle.
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.
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Bundle branches
Offshoots of the bundle of His in the heart's ventricle. They play an integral role in the electrical conduction system of the heart by transmitting cardiac action potentials from the bundle of His to the Purkinje fibers.
Purkinje Fibers
Specialized conductive myocardial cells with few myofibrils that promotes the rapid conduction of the impulse through the ventricles.