IMG_0003 - 2 diaphragm its superior surface 3 thoracic wall...

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I. RESPIRATORY SYSTEM Cells use oxygen ) carbon dioxide ) lungs ) oxygen ) blood ORGANS 1. Nose 2 openings: external nares (nostrils) nasal cavity: space behind the external nose : throat = muscular tube carries both food and air between trachea and pharynx swallowing prevents food from entering trachea sound production held open by incomplete rings of cartilage extends from larynx and then divides into: branch offof the trachea and enter the lung apex (cupola) cardiac notch (left lung) ) 3. Pharynx Larynx 4. Trachea 5. Primary Bronchus 6. Lungs MUSCLES u. m. l. Diaphragm: contracts during respiration 2. Intercostal Muscles LININGS play important roles in breathing Pleurae: consists of rwo layers of serous mernbrane (moist) which surrounds each lung. Their opposite surfaces (layers) almost touch. a) Visceral pleura = is the inner layer which covers the surface of the lungs b) Parietal pleura : outer layer which lines the: 1. mediastinum (cavity between the lungs)
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Unformatted text preview: 2. diaphragm - its superior surface 3, thoracic wall - inner portion The visceral and parietal pleura are a continuation of the same serous membrane. Between them is the small slit-like pleural cavity, which contains pleural fluid. This fluid acts as a lubricant to assist breathing and is secreted by the pleura. Each lung is actually enclosed then by a separate sac. ill Alveolar fluid Lines the inner surface of the alveolus and creates surface tension (force) It is like a film that is made up mostly of water. This tension pulls the alveolus inward which reduces its size. This effect is prevented of course by surfactant. YItr. RESPIRATORY MEMBRANE This membrane consists of the alveolar wall plus the capillary wall. Therefore, it is two layers of simple epithelium. It is only about 0.5 micro-meters thick so it easily allows for the diffusion of oxygen and carbon dioxide. tlu...
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This note was uploaded on 12/16/2011 for the course BIOL 230 taught by Professor Dr.abdirkin during the Fall '10 term at St. Thomas FL.

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IMG_0003 - 2 diaphragm its superior surface 3 thoracic wall...

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