Question

In a typical heart, if EDV is 120 ml and ESV is 50 ml, the stroke volume (SV) is
A) $120-50=70ml$
B) $120\times 50=6000ml$
C) $120+50=170ml$
D) $120\mathrm{\%}50=2.4ml$.

Answer 1

Hint: The term cardiac output can be defined in terms of this equation:
$\text{Cardiac output = heart rate}\times \text{stroke volume}$.
The stroke volume is the amount of blood the heart can pump in each cardiac cycle while the heart rate is defined as heart beats per minute.

Complete answer:
In fact, the volume of stroke (SV) is the sum of blood expelled from each ventricle due to the contraction of the muscle of the heart that compresses these ventricles. The distinction between end diastolic volume (EDV) and end systolic volume is SV (ESV).
$SV=EDV-ESV$
Until contraction, the EDV is filled with the ventricular volume of the ventricle and the ESV is the excess volume of blood left in the ventricle after ejection. SV reflects the discrepancy between EDV and ESV. So if EDV is 120 ml and then ESV is 50 ml, the amount of stroke is $120-50=70ml.$

Men, owing to the greater size of their lungs, have higher stroke volumes on average than women. Stroke volume, however, depends on many variables, such as heart size, contractility, contraction length, preload (end-diastolic volume), and afterload.

Hence, the correct answer is option (A).

Note: Stroke volume is a significant determinant of cardiac production, and is the product of stroke volume and heart rate, which is often used to measure the fraction of ejection, which is the volume of stroke divided by the volume of end-diastolic. Although the number of strokes under some circumstances and disease states reduces, the volume of strokes itself correlates with heart activity.