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.
The main pulmonary artery is responsible for transporting oxygen-depleted blood away from the heart and back toward the lungs. The main artery splits into the left pulmonary artery and the right pulmonary artery, each of which directs the blood to the corresponding lung.