Final answer:
The surge of blood from the left ventricular contraction during the ventricular systole is known as the ventricular ejection phase.
Step-by-step explanation:
The surge of blood caused by the left ventricular contraction is called the ventricular ejection phase. This phase occurs during the ventricular systole when the contraction of the ventricular muscle raises the pressure inside the ventricle above that of the pulmonary trunk and the aorta. This process propels open the pulmonary and aortic semilunar valves and allows blood to be pumped out from the heart. The pressure generated by the left ventricle needs to be significantly higher than that from the right ventricle, to overcome the high aortic pressure. Nonetheless, both ventricles pump the same volume of blood, termed the stroke volume, which is usually between 70-80mL.