Although there are many ingredients used to make glue, most formulas contain something called polymers. A polymer is a large molecule that often is described as being a long molecular strand, much like spaghetti.
The pulmonary artery carries deoxygenated blood from the heart to the lungs. It is one of the only arteries (other than the umbilical arteries in the fetus) that carries deoxygenated blood.
Pulmonary artery - Pulmonary arterial tree. 1  In order of blood flow, the pulmonary arteries start as the pulmonary trunk or main pulmonary artery. 2  The main pulmonary artery splits into the right and the left main pulmonary artery. [1] 3  truncus anterior â supplies blood to the right upper lobe.