<h3>The blood in the pulmonary artery is going to the heart to collect oxygen, and therefore has a low content of oxygen. So, the blood in the pulmonary artery is a violet colour because it has low oxygen. The blood in the pulmonary vein is oxygen rich, and so it gives a scarlet</h3>
The correct order of blood flow is a. Aorta --right atrium--right ventricle--lungs--left atrium-- left ventricle--vena cava. B.
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