What percentage of ventricular filling occurs actively? 40-60% 10-20% 20-30% 50-60%

The correct answer is $40-60\%$.<br /><br />Ventricular filling occurs in two phases: passive filling and active filling. Passive filling accounts for approximately $40\%$ of ventricular filling, while active filling accounts for the remaining $60\%$. Active filling is driven by the contraction of the atria, which pushes blood into the ventricles.