The Functions of the different

Pulmonary artery
   The pulmonary artery delivers blood from the heart to the lung for oxygen.
 

Pulmonary veins
   The pulmonary veins deliver oxygen-rich blood from the lungs back to the heart
 

Left atrium
   The left atrium receives oxygen-rich blood from the lungs.
 

Mitral valve
   The mitral valve permits blood to flow from the left atruim to the left ventricle.
 

Left ventricle
   The left ventricle pumps blood into the aorta.
 

Aorta
   The aorta directs oxygen-rich blood from the heart to the body.
 

Aortic valve
   The aortic valve controls the blood flow out of the heart into the aorta.
 

Right ventricle
   The right ventricle pumps blood into the pulmonary artery.

 
Inferior vena cava
   The inferior vena cava returns blood from the lower body to the heart.
 

Pulmonary valve
 The pulmonary valve controls the blood flow from the heart to the pulmonary artery.
 

Right atrium
  The right atrium receives oxygen-depleted blood from the upper and lower body.
 

Superior vena cava
   The superior vena cava returns blood from the upper body to the heart.