Blood collected by superior vena cava from the upper part of
the body and by inferior vena cava from the lower part of the body
delivered to Right atrium of Heart.
Then blood from the right atrium goes to the Right
ventricle via the Right atrioventricular
valve(Right AV Valve).
Blood goes from Right Ventricle to Pulmonary
aorta via Pulmonary valve.
Then blood goes to lungs for oxygenation
Blood enters in Left atrium by
Pulmonary vein.
When Left atrium pumps blood goes to
Left ventricle via Mitral
valve.
Then blood goes to Aorta from the Left
ventricle via Aortic valve.
Then Aorta distributes oxygenated blood throughout body via
various arteries.