PHGY 214 Lecture Notes - Lecture 11: Bronchiole, Intercostal Muscle, External Intercostal Muscles
28 Apr 2016
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Document Summary
Physical components: lung, chest wall: everything from the rib cage, abdomen, abdominal muscles, diaphragm. Functional components: airways: conduct air from environment into lungs, alveoli: gas exchange through diffusion. Trachea: large conductive airway reinforces by cartilagenic rings, reinforcement, very strong. Primary bronchi: divisions of trachea into 2 conducting airways that supply the lungs without ventilation. Bronchiole: smaller division, no more cartilage as it is replaced with smooth muscle. Terminal bronchiole: final one before entering into the alveolar sac. Alveoli: dense cappilerization allowing for gas exchange. The respiratory system: the lung -- functional components, airways (convection -- p. 451-2; p. 572-3, fig 17-2, ii. Alveoli (includes respiratory bronchioles and alveolar sacs ; gas exchange/diffusion -- p. 452-3, figs. 11-2 and 11-3; p. 573, fig 17-2f,g,h: the chest wall - includes active pump muscles (p. 453, fig. 2a,b: inspiratory: diaphragm, external intercostals, other accessory muscles when respiratory drive increases breathing in.
