Final answer:
The C wave corresponds with the AV valve bulging during ventricular contraction, which is seen during the QRS complex on an ECG.
Step-by-step explanation:
The wave that corresponds with the AV valve bulging during ventricular contraction is the C wave. This occurs because, during ventricular contraction or systole, the increase in ventricular pressure causes the atrioventricular valves (tricuspid and mitral valves) to close, leading to a slight backflow of blood that can bulge the valves upwards into the atria, producing the C wave. The sequence of electrical events leading to this mechanical action starts with the depolarization of the atria, indicated by the P wave on an electrocardiogram (ECG), followed by atrial systole. This is succeeded by ventricular depolarization, represented by the QRS complex, which results in ventricular contraction and the closure of the AV valves, correlating with the C wave.