BIOL 382 Lecture Notes - Lecture 16: Carbonic Anhydrase, Partial Pressure, Enzyme
Document Summary
Air passes from the nares, mouth to cartilage reinforced trachea. At the syrinx, trachea branches into 2 primary parabronchi. Lungs are stiff and change little in volume: advantage for capillaries that fo not have to withstand strain of size change. Lungs are between a series of air sacs that act as bellows. As the primary bronchi enter the lungs, What happens during mammalian tidal ventilation? they branch into dorsobronchi parabronchi. Walls of parabronchi folded to form air cappilaries: richly vascularized, site of gas exchange. Bronchi branch into secondary and tertiary bronchi and bronchioles. Bronchioles terminate in alveoli (gas exchange surfaces) Outer surface of alveoli and are covered in capillaries. Intrapleural pressure is subatmospheric, which keeps the lungs expanded and the alveoli from collapsing. This subatmospheric pressure pulls on small airways and alveoli to keep them open. Lung compliance: how easily the lungs stretch during inhalation. Loss of compliance in fibrotic lung from breathing silicon, asbestos.
