The equation for stroke volume is:

Correct option is C

Ans: (c) EDV - ESV Sol. The stroke volume (SV) is the amount of blood pumped by the heart with each beat. The correct equation for stroke volume is:
SV = End Diastolic Volume (EDV) - End Systolic Volume (ESV).
· EDV refers to the volume of blood in the ventricle just before contraction (at the end of diastole).
· ESV refers to the volume of blood remaining in the ventricle after contraction (at the end of systole).
Thus, stroke volume is the difference between the EDV (fullness of the heart before contraction) and ESV (remaining blood after contraction), representing the amount of blood ejected with each heartbeat.
Explanation of each option:
· (a) Heart Rate (HR) + End Systolic Volume (ESV): This is incorrect. Heart rate and ESV are not directly related in the equation for stroke volume.
· (b) End Diastolic Volume (EDV) + ESV: This is incorrect because stroke volume is the difference between EDV and ESV, not their sum.
· (d) HR - ESV: This is also incorrect. Heart rate (HR) does not directly affect the stroke volume equation, and subtracting ESV from HR doesn’t yield stroke volume.