Dear Expert,

How come de-oxygenated blood from the right ventricle and auricle flows into the pulmonary ARTERY and oxygenated blood flows from the pulmonary VEIN into the left auricle and ventricle. Doesn't that deny the fact that oxygenated blood flows in the arteries and de-oygenated blood in the veins?

Question

Dear Expert,
How come de-oxygenated blood from the right ventricle and
auricle flows into the pulmonary ARTERY and oxygenated blood flows
from the pulmonary VEIN into the left auricle and ventricle Doesn't
that deny the fact that oxygenated blood flows in the arteries and
de-oygenated blood in the veins?

Krishnakoli Datta · Accepted Answer

Pulmonary artery and pulmonary vain
are the two exceptions in human circulatory system in which
pulmonary artery carries deoxygenated blood and pulmonary vein
carries oxygenated blood Other than these two all arteries carry
oxygenated blood and all veins carry deoxygenated blood