Question

left atrium receives oxygenated blood from where? detailed explanation pls..... ​

Answer 1

I can explain you from beginning. At first deoxygenated blood comes from all the parts of the body. Then they enter Superior and Inferior Vena Cava from there they go to Right Atrium from there they go to Tricuspid Valve , after that they go to Right Ventricle. Then the blood goes to Pulmonary Artery . From Pulmonary Artery the deoxygenated blood goes to lungs and it becomes oxygenated. From lungs oxygenated blood goes to Pulmonary Vein. From there they go to Left Atrium, after that they go to Bicuspid Valve , then the enter Left Ventricle . From the Left Ventricle the oxygenated blood goes to Aorta and the Aorta delivers the blood to all the body parts.

In short Left Atrium receives the oxygenated blood from Pulmonary Vein.