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.
Blood is conveyed from the pulmonary trunk to the left and right pulmonary arteries. Pulmonary Arteries. The main pulmonary artery extends from the heart and branches into a right vessel and a left vessel. Right Pulmonary Artery (RPA): directs blood to the right lung. Extending from the pulmonary trunk, it dips under the aortic arch and behind the superior vena cava to the right lung. The RPA branches into smaller vessels within the lung. Left Pulmonary Artery (LPA): directs blood to the left lung.