Question

why pulmonary artery gives blood supply to the respiratory zone of lungs. For 3 marks​

Answer 1

In heart, $\textbf{Pulmonary Artery }$ gives blood supply to the respiratory zone of lugs because to oxidise the blood by oxygen from lungs.

From right ventricle, blood by pressure passes through pulmonary artery. The blood passing through it is actually lacks oxygen. Hence, to oxidise the blood it reaches to lungs.