The respiratory system is composed of the nasal passages, pharynx, larynx, trachea, bronchi and lungs. Its primary function is to absorb oxygen and excrete carbon dioxide, but that's not all it does. All of the systems of the body work together to keep you healthy. The respiratory system effects many of the body's other systems and processes in a number of ways.Your respiratory system is made up of the organs in your body that help you to breathe. The whole point of the breathing process is when you exhale you are giving out carbon dioxcide which plants use, and plants such as trees produce oxygen which we need. The main organ of the resiratory system is the LUNG.The red blood cells are responsible for picking up the oxygen in the lungs and carrying the oxygen to all the body cells that need it.