BIOL 2312 Chapter Notes - Chapter 48: Carbonic Anhydrase, Red Color, Whole Blood
12 Sep 2017
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48. 4- structures, mechanisms, and control of ventilation in mammals: lung structure and function supports the respiratory cycle: Visceral pleural membrane- outside of each lung covered in this thin membrane ----> Pleural cavity- filled with fluid, adhere the two membranes, couples them to thoracic cavity---> Parietal pleural membrane- lines inner wall of thoracic cavity: inhalation: Contraction of external intercostals raises the ribs and expands rib cages. Relaxation of intercostals and diaphragm produce unforced exhalation because of elastic tension being released. Ventilation efficiency depends on lung capacity: each breath has a tidal volume of 500 ml. 150 of that air is in the tubular passages (trachea, bronchi, bronchioles) no gas exchange occurs (anatomical dead space) Gases of this space mix with fresh air and is one of the reasons mammals are not as efficient as others. Because there is one way: vital capacity- max amount of air that can be inhaled.
