What is special about the pulmonary artery?

The pulmonary artery goes away from the heart, so does not actually do anything for the heart. However, once blood enters the heart via the venae cavae (the veins that bring the body's entire blood supply into the heart) it then travels through the right atrium to the right ventricle, through yes!, the pulmonary artery (pulmonary means pertaining to the lungs) . From there the blood travels to the lungs through the pulmonary artery and branches into capillaries, where the exchange of carbon dioxide to oxygen occurs. The blood then travels back to the heart through the pulmonary vein, the exception to the rule that veins are oxygen-poor. From there the blood enters the left atrium, is pumped into the left ventricle, and from there is pushed into the aorta where it travels to supply the entire body with the now-oxygenated blood.

So, that is the relationship the pulmonary artery has with the heart. The cornonary arteries, which feed off of the aorta, are what supply the heart itself with blood. Just in case that's what you were looking for by asking this question.

Hope that answers your question!!!!!