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2130, lab exam 1
lab ex. 31
13
Anatomy
Undergraduate 2
02/11/2007

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Term
functional syncytium
Definition
the syncronization of the heart functioning as a single unit
Term
intrinsic conduction system
Definition
nodal system: control system on heart activity with the nervous system. Consists of sepicalized noncontractile myocardial tissue. It ensures that heart muscle depolarizes in an orderly and sequential manner and that the heart beats as a coordinated unit.
Term
SA node
Definition
sinoatrial: part of the nodal system, located in the right atrium just inferior to the entrance to the superior vena cava, has the highest rate of discahrge, provides the stimulus for contractionreferred to as the PACEMAKER. From the SA node, the impulse spreads throughout the atria and to the AV node, followed by atrial contraction.
Term
AV node
Definition
atrioventricular node: in the lower atrial septum at the junction of the atria and ventricles, where the impulse is momentarily delayed, allowing the atria to complete their contraction, then the impulse passes through the AV bundle and to the right and left bundle branches...etc.
Term
AV bundle (bundle of His)
Definition
leads to the purkinje fibers
Term
purkinje fibers
Definition
long strands of barrel-shaped cells which ramify within the muscle bundles of the ventricular walls. Its network of fibers is much denser and more elaborate in the left ventricle because of the larger size of this chamber.
Term
electrocardiogram (ECG)
Definition
makes a graphic recording of the electrical changes occurring during the cardiac cycle.
Term
P wave
Definition
the first wave in an ECG, is a small wave that indicates depolarization of the atria immediately before atrial contraction
Term
QRS complex
Definition
a larg spike-wave, resulting from ventricular depolarization, has a complicated shape. Precedes ventricular contraction.
Term
T wave
Definition
results from currents propagated during ventricular repolarization
Term
tachycardia
Definition
a heart rate over 100 bpm
Term
bradycardia
Definition
a heart rate below 60 bpm
Term
fibrillation
Definition
a condition which prolonged tachycardia may develop into. Is a condition of rapid uncoordinated heart contractions which makes the heart useless as a pump.
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