True: During ventricular diastole, the ventricles are filled with blood., Action potentials travel in a unidirectional manner along the neuron., Plasma is the liquid component of blood that carries red and white blood cells., The coronary arteries supply oxygen-rich blood to the heart muscle., The pulmonary circulation involves the flow of blood between the heart and the lungs., False: The P wave on an electrocardiogram represents ventricular depolarization., The first heart sound (S1) is caused by the closure of the semilunar valves., The heart's relaxation phase is known as systole, The heart's electrical signals originate from the atrioventricular (AV) node., Red blood cells contain a nucleus,

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