Final answer:
The statement is false; after the ejection phase, the ventricles retain a certain volume of blood known as the end systolic volume (ESV), which is usually about 50-60 mL.
Step-by-step explanation:
The claim that at the end of the ejection phase there is no blood remaining in the ventricles is false. During the ventricular ejection phase of the cardiac cycle, the contraction of the ventricles pushes blood into the pulmonary trunk and the aorta. However, not all the blood is ejected. There is still a volume of blood left in the ventricles, known as the end systolic volume (ESV). The ESV is typically in the range of 50-60 mL, following the ejection of the stroke volume, which ranges from 70-80 mL from an end diastolic volume (EDV) of approximately 130 mL.
The isovolumic contraction phase, also known as isovolumetric contraction, is a phase in the cardiac cycle where the ventricles contract but no blood is ejected because the pressure is not yet sufficient to open the semilunar valves. Hence, during this initial phase of ventricular systole, the volume within the ventricles remains the same.