Answer:
b. blood flows passively through the atria and the open AV valves into the ventricles.
Step-by-step explanation:
During the period of ventricular filing, blood flows passively through the atria and the open AV valves into the ventricles.
During the period of ventricular filing blood flows passively through the atria and the open AV valves into the ventricles-b.
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