Final answer:
The medical question pertains to an ejection click during the ventricular ejection phase of ventricular systole, where the left ventricle pumps blood into the aorta. Stroke volume is the quantity of blood pumped during each cycle, with post-ejection residual being the end systolic volume (ESV).
Step-by-step explanation:
An ejection click at the left second intercostal space that happens in early-mid systole and whose intensity does not vary with inspiration refers to a specific cardiac event. During the ventricular ejection phase, the left ventricle pumps blood into the aorta through the aortic semilunar valve. This phase is the second part of ventricular systole where the contraction of the ventricular muscles raises intraventricular pressure above that in the aorta, allowing for the ejection of blood.
The volume of blood pumped out during each cardiac cycle is known as the stroke volume, typically ranging between 70-80 mL. The remaining blood after the ventricular ejection is the end systolic volume (ESV), about 50-60 mL. An ejection click can be associated with slight anomalies in valve function but typically, in the absence of other abnormal sounds, does not indicate a significant pathology.