ventricular ejection isovolumetric contraction ventricular filling isovolumetric relaxation End diastolic volume and the first heart sound are observed during the \( \square \) phase of the cardiac cycle. The P wave and subsequent atrial contraction are evident during the \( \square \) phase of the cardiac cycle. The semilunar valves open during the \( \square \) phase of the cardiac cycle, allowing blood to exit the ventricles. The dierotic notch occurs during the \( \square \) phase of the cardiac cycle. Submit
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End diastolic volume and the first heart sound are observed during the **isovolumetric contraction** phase of the cardiac cycle. This phase marks the transition between diastole and systole, where the ventricles are filled to capacity but the heart valves are closed, creating a tense environment as the myocardium begins to contract. The P wave and subsequent atrial contraction are evident during the **ventricular filling** phase of the cardiac cycle. This is when the heart is gearing up for the main event; the atria contract to push blood into the ventricles, and the heart sounds like a well-rehearsed symphony ready to crescendo. The semilunar valves open during the **ventricular ejection** phase of the cardiac cycle, allowing blood to exit the ventricles. It's like a dramatic moment when the tension reaches its peak, and the blood surges into the aorta and pulmonary artery, delivering oxygen-rich blood where it's needed. The dicrotic notch occurs during the **isovolumetric relaxation** phase of the cardiac cycle. This fascinating little dip in blood pressure is like a gentle wave goodbye, representing the closure of the aortic valve as the heart takes a brief moment to refill for the next cycle.
