What does ESV stand for in cardiac physiology?

End Systolic Volume (ESV) is a crucial concept in cardiac physiology, representing the volume of blood remaining in the ventricles at the end of contraction, or systole. Understanding ESV is important when analyzing the cardiac cycle and the heart's efficiency in pumping blood.

During each heartbeat, the heart ejects a certain volume of blood into the circulation. The amount of blood that remains in the ventricle after this contraction is what we define as ESV. This measurement is significant because it helps in assessing cardiac function and can indicate conditions like heart failure when ESV is elevated, as the heart is unable to pump effectively.

In relation to the other choices, "End Systolic Value" is a term that is not used in this context; "Electro Systolic Volume" is not a recognized term in cardiac physiology; and "End Stroke Volume" conflates terms, as stroke volume refers to the volume of blood ejected from the heart during systole, not to be confused with ESV.

Hence, the correct choice of End Systolic Volume provides the most accurate and relevant definition within the framework of cardiac physiology.