Document r24Bgogb6j2GbmgOQ7J5D5GE

Page 420 1 A Yes, sir, intercostal muscles, intercostal 2 nerves. 3 Q Now, where is -- does the trachea branch off 4 into bronchi? 5 A Yes. The trachea comes down, and this is 6 the main airway and it branches off into left and -7 this is the left and this is the right main stem 8 bronchus and then when the bronchi, the main bronchi 9 going to the lungs, they subsequently branch just like 10 a tree branches into multiple smaller branches. 11 Q As they branch off, what are the names of 12 the smaller branches? 13 A Well, those are called different size 14 bronchi, segmental, subsegmental bronchi and 15 ultimately bronchioles which means little bronchi, and 16 then the bronchioles actually end up feeding into what 17 are called alveoli which are the very small air sacs. 18 Q What is the purpose of the alveoli? 19 A Well, in the alveoli, that is where the 20 capillaries bring blood right up to the surface where 21 air is so gas exchange can occur.