Pure Herbs herbal extracts historically used to support the Respiratory System, which is composed of the lungs and respiratory passages, allows us to breathe. The Respiratory System, allows us to breath. Breathing is an exchange of gases - the body takes in oxygen and expels carbon dioxide. This system consists of the lungs which is where the gaseous exchange takes place and the respiratory passages or airways which guide the air to the lungs. It includes the nose, larynx (sound box), trachea (windpipe), bronchi and lungs.