Stroke volume
The definite volume of blood pumped into the aorta / pulmonary trunk by each ventricular contraction (left / right) is referred to as stroke or pulse volume or the systolic discharge.
If the stroke volume is expressed based on body weight it is known as stroke index.
![Stroke volume of animals](https://vetscraft.com/wp-content/uploads/2021/08/019-Stroke-volume-of-animals.jpg)
A portion of the blood is left in the ventricles even after the ventricular systole, which is known as end systolic volume. Similarly, the volume of blood present in the ventricles at the end of the diastole is referred to as end diastolic volume.