In most mammalian tissues, ubiquinone (also called coenzyme Q) has 10 isoprene units.

Dolichols of animals have 17 to 21 isoprene units (85 to 105 carbon atoms), bacterial dolichols have 11, and those of plants and fungi have 14 to 24.

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T wave - Ventricular Repolarization

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PR segment – Conduction through AV node

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PR interval - Atrioventricular conduction

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QT interval includes the QRS complex, the ST segment, and the T wave.

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ST segment - plateau portion of the ventricular action potential.

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The U wave is an inconstant finding that may be due to ventricular myocytes with long action potentials.