If oxygenated blood flows in the artery and deoxygenated blood flows in veins then why does blood comes in the left atrium through pulmonary veins and goes out from the right ventricle through the pulmonary artery in the heart?
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Solution
Blood flow:
The blood which flows away from the heart is known as the artery, and the one which brings blood toward the heart is called the veins.
We mostly see that the arteries carry oxygenated blood from the heart to other parts of the body and deoxygenated blood from different parts of the heart.
Now there is an exception in the case of the heart, we see that the right ventricle receives the deoxygenated blood from the right atrium which is then pumped to the pulmonary artery that takes away the blood from the heart to the lungs for oxygenation.
After oxygenation of blood from the lungs it comes back to the heart through the pulmonary vein(vein carries blood toward the heart).
Now, this oxygenated blood is pumped to different parts of the body.