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An action potential spreads through the atria by gap junctions, but there are no gap junctions present in the ventricles, so the impulse must be propagated throughout the ventricular myocardium by the bundle of His and Purkinje system.
Q63: Contraction is triggered as Ca²⁺ causes troponin
Q75: Creatine phosphate
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Q102: Single-unit smooth muscle has no innervation.
Q133: Fast-glycolytic muscle fibers do not require as
Q158: Organs that recondition the blood normally receive
Q164: Has short preganglionic fibers
Q174: The function of the ventricular conduction system
Q231: The sarcoplasmic reticulum stores _ when a
Q236: Is considered to be involuntary