By Rafael Pelajio This is a diagram of a rats respiratory system. Its shows the organs that help the function of respiration. The respiratory system is the system which allows us to breath in oxygen. The main organ we use is the lungs. If there where no lungs then we would die. It allows oxygen to flow in he body carried by red blood cells. This is a picture of a rats respiratory system. This is a picture of a rat getting dissected to get its respiratory system looked at.