Pulmonary Lab - Melissa Reyes UFID: 6786-5269 April 8, 2010...

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Melissa Reyes UFID: 6786-5269 April 8, 2010 Pulmonary Lab Introduction The main function of the lung is for gas exchange between the environment and the blood and to assist in acid-base balance. Oxygen is consumed from alveolar gas into the blood, while carbon dioxide is expelled from the blood into the lung. Ventilation is the mechanical movement of air in and out of the lungs. While respiration is the process of gas exchange, which works at two levels: internal and external. Internal respiration is the cellular use of oxygen to generate ATP and the production of carbon dioxide. External respiration is the movement of oxygen and carbon dioxide between the environment and body tissues. This type of respiration uses four processes: pulmonary ventilation (the flow of air in and out of the lungs), gas exchange between the lungs and the blood, transportation of the gases, and gas exchange between the blood and the tissues. Spirometry is used to tell the difference between obstructive pulmonary diseases (increases airway resistance) and restrictive pulmonary diseases (interference of lung expansion). The two parameters measured are the forced vital capacity (FVC – maximal amount of air a patient can expire following a maximal inspiration) and the forced expiratory volume (FEV – measure of the percentage of the FVC that can be exhaled in a certain amount of time, usually 1 second FEV 1 ). Persons with obstructive disorders have a lower than normal FEV 1 , while a person with a restrictive disorder has a lower than normal FVC. The normal FEV 1 to FVC ratio
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Pulmonary Lab - Melissa Reyes UFID: 6786-5269 April 8, 2010...

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