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This same A relaxed adult breathes an average of 15 times a minute lyrica 75mg without prescription, technique is used when lifting a heavy object, in which ventilating approximately 6 liters of air during this period. Strenuous exer- • It enables protective and reflexive nonbreathing air move- cise increases the demand for oxygen and increases the respira- ments, as in coughing and sneezing, to keep the air pas- tory rate fifteenfold to twentyfold, so that about 100 liters of air sageways clean. If breathing stops, a person will lose consciousness after 4 or 5 minutes. Brain damage may occur after 7 to 8 minutes, and the person will die after 10 minutes. Knowl- Basic Structure edge of the structure and function of the respiratory system is of the Respiratory System therefore of the utmost importance in a clinical setting. The major passages and structures of the respiratory system are the nasal cavity, pharynx, larynx and trachea, and the bronchi, bronchioles, and pulmonary alveoli within the lungs (fig. Physical Requirements The structures of the upper respiratory system include the of the Respiratory System nose, pharynx, and associated structures; the lower respiratory The respiratory system includes those organs and structures that system includes the larynx, trachea, bronchial tree, pulmonary function together to bring gases in contact with the blood of the alveoli, and lungs. In order to be effective, the respiratory system On the basis of general function, the respiratory system is must comply with certain physical requirements. The conducting division includes all of the cavities and • The surface for gas exchange must be located deep within structures that transport gases to and from the pulmonary alveoli. Early Greek and Roman scientists placed great emphasis on the invisible material that was breathed in. They knew nothing • The membrane must be kept moist so that oxygen and car- about oxygen or the role of the blood in transporting this vital sub- bon dioxide can be dissolved in water to facilitate diffusion. For that matter, they knew nothing about microscopic structures like cells because the microscope had not yet been in- vented. Early Greeks referred to air as an intangible, divine spirit called respiration: L. Respiratory System © The McGraw−Hill Anatomy, Sixth Edition Body Companies, 2001 604 Unit 6 Maintenance of the Body Nasal cavity Nostril Choana Hard palate Soft palate Pharynx Epiglottis Esophagus Larynx Left principal (primary) bronchus Trachea Lobar bronchus Segmental bronchus Right lung: Superior lobe Left lung: Superior lobe Middle lobe Inferior lobe Inferior lobe Cardiac impression FIGURE 17. Objective 4 List the types of epithelial tissue that characterize Knowledge Check each region of the respiratory tract and comment on the 1. What are the physical requirements of the respiratory sys- Objective 5 Identify the boundaries of the nasal cavity and tem?