em that allows the human body to breath. The entire respiratory system includes the nose, mouth, trachea (wind pipe), and bronchi (Haas 45). The lungs have several important jobs. One job is to inhale oxygen, which is fuel for the body's tissues. The lungs also exhale carbon dioxide, a byproduct of the working tissues. It is important that the body maintains a healthy balance between the two gasses since the body depends on this balance to sustain vital organs, including the heart and brain (Haas 46). Healthy lungs maintain this important balance by taking automatically varied, unconscious breaths. This is done by the bronchi which are muscle. The bronchi will expand when there is demand for more air, such as during intense exercise. The bronchi will also contract when little air is needed or to b!
             lock out an irritant such as cigarette smoke. The temperature and humidity of incoming air is also adjusted so that the maximum amount of oxygen can be extracted (Haas 48).
             The respiratory system of an asthmatic reacts to a variety of irritants. These irritants can be allergies, foods, emotions, and/or exercise(Nolte104). When an irritant enters the airway, the bronchi responds by contracting it's muscles to shut it out. In addition, the cells in the airway are stimulated and try to fight off the irr
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