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12 Terms

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cardiac index: CO/m2

SVxHR

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Pacemaker

no constant resting membrane potential, pacemaker potential or diastolic depolarization

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Conductive pathway

SA-node, AV-node, His bundle, Tawara brances, and Purkinje fibers

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SA-node

nomotopic impulse generating center, Other: heterotopic or ectopic impulse generation

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P-wave

depolarization of the atrium (<0.12sec)

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PQ interval

conduction time (0.12-0.2 sec)

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QRS complex

ventricular depolarization (0.06-0.1 sec)

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ST segment

the ventricular muscle is depolarized

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T-wave

ventricular repolarization.

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EEG

examines the electrical activity of the heart as a function of time

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Mechanical activity of the heart

• isotonic and isometric contraction
• isotonic and isometric relaxation

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Starling's law of the heart

Strength of myocardial contractility depends on the initial length of muscle fibers (sarcomeres), the passive tension of the muscle.