The Respiratory System Structure And Function. The respiratory system is the system in the human body that enables us to breathe. The act of . The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are lungs, which carry out this exchange of gases as we breathe..These include the nose, pharynx, larynx, trachea, bronchi and lungs. The respiratory system does two very important things it brings oxygen into our bo.s, which we need for our cells to live and function properly and it helps us get rid of carbon dioxide, which is a waste product of cellular function.. The respiratory system, which includes air passages, pulmonary vessels, the lungs, and breathing muscles, aids the body in the exchange of .