2) Ventricular Systole/Atrial Diastole:
Ventricles are CONTRACTING (0.3 sec) – Atria are RELAXED
End-Systolic Volume (ESV): the blood volume remaining in each ventricle at the end of systole.
Stroke-Volume (SV) : the blood volume ejected per beat from each ventricle
SV = EDV – ESV . Stroke volume in a resting horse is ~ 800 – 1000ml.
(Stroke volume can increase 20-50% with work or exercise)
3) Relaxation
Atria and Ventricles are both RELAXED (0.4 sec)
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