ANP 1105 Study Guide - Final Guide: Tidal Volume, Rib Cage, Pulmonary Compliance

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Jacqueline Carnegie

Document Summary

6. 3 deine and explain the following: intrapulmonary, intrapleural and transpleural pressures. Intrapulmonary pressure (alveolar: (ppul) is the pressure in the alveoli of the lungs, rises and falls with breathing but always eventually equalizes with atmospheric, po2 in the alveoli is 104 mmhg. Intrapleural pressure (pip: pressure in the pleural cavity, ~4 mm hg less than pressure in alveoli, lung collapsing pressure, negaive, interacion of 3 factors. Surface tension of pleural luid and elasicity of chest wall: lungs in separate pleural caviies, one can collapse and not the other. Transpleural pressure: keeps the air spaces in the lung open: intrapulmonary intrapleural. 6. 4 explain the roles of the diaphragm and accessory muscles during inspiraion and expiraion( quiet and forced) Increased volume of thoracic cavity >> decrease pressure of gas inside >> air rushes in through only opening (trachea) Diaphragm contracts to increase height of thoracic cavity. Intercostals contract to lit rib cage up and pull sternum forward to increase thorax diameter.