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It is your "PULMONARY ARTERY" and your "PULMONARY VEIN." There purpose is to carry De-Oxygenated blood to the lungs and oxygenated blood back to the heart. Your "Pulmonary Artery" carried De-Oxygenated Blood from the heart to the lungs (Your "Pulmonary Artery" is the ONLY ARTERY that carries De-Oxygenated Blood, all the other arteries carry Oxygenated Blood to the body.) Your "Pulmonary Vein" carries the oxygenated blood from the lungs back to the heart. (Your Pulmonary Vein is the ONLY VEIN that carries Oxygenated blood back to the heart, all other veins carry De-Oxygenated Blood to the Heart.)
HOW IT WORKS:
1) De-Oxygenated Blood enters the heart from the rest of your body though the Superior or Inferior Vena Cava into the Right Atria of the heart.
2) The De-Oxygenated Blood in the right atria is Pumped though a valve called the "Tricuspid Valve" into the Right Ventricle.
3) The De-Oxygenated Blood in the Right Ventricle is Pumped though another valve called the "Pulmonary valve" into the Pulmonary Artery where is is brought to the Lungs.
4) The Blood is Oxygenated in the Lungs and put into the Pulmonary Vein to be brought back to the heart.
5) The Oxygenated Blood enters the Heart through the Left Atria.
6) The Oxygenated Blood in the Left Atria passes thought a valve called the "Mitral Valve" into the Left Ventricle.
7) The Oxygenated Blood in the Left Ventricle is pumped though a valve called the Aortic Valve into the Aorta.
8) The Oxygenated Blood in the Aorta is Pumped out though your arteries to the rest of the body.
Your heart is a Big Muscular Pump.
Your Pulmonary tract is the reason your blood has oxygen it it. (The Hemoglobin in your blood carries the oxygen.)
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