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Respiratory Physiology Function of the respiratory system: * Ventilation and gas exchange..Metabolic functions *.H2O balance *.Temperature regulation *.H+ balance *.Blood reservoir * 2 :Definition of respiration The process by which we get energy from food.stuffs...

Respiratory Physiology Function of the respiratory system: * Ventilation and gas exchange..Metabolic functions *.H2O balance *.Temperature regulation *.H+ balance *.Blood reservoir * 2 :Definition of respiration The process by which we get energy from food.stuffs Steps of respiration: Pulmonary ventilation A- External respiration Pulmonary respiration.B- Transport of gases 3 Physiological anatomy of the respiratory system * Nose------------ warm, moisten and filter air. * Pharynx ----Tubular passage way from nose to the larynx. * Larynx ---- Guard over trachea, organ of voice. 5 * Alveolar sacs ------------ gas exchange. * Respiratory muscles ------- Inspiratory and expiratory muscles. * Respiratory centers and nerves ----control and 6 7 8 9 Mechanism of :pulmonary ventilation :Inspiratory muscles.During resting inspiration.diaphragm *.external intercostals muscles Forced deep inspiration: the above muscles and :.scalene muscles *.strenomastoid muscles * 10 Expiratory muscles: Normal quiet expiration * elastic properties of the lung. * elevation of the diaphragm. * weigh of thoracic cage. Forced expiration: the above muscles forces and contraction of : * rectus internal and external abdomens muscles. * internal intercostals muscles. 11

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