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img045 - D j SECONDARY BRONCHUS split from the primary 3 on...

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Unformatted text preview: D j SECONDARY BRONCHUS - split from the primary, 3 on right and 2 on the left sides (lung lobes), give rise to segmental b. D I] SEGMENTAL (TERTIARY) BRONCHID small branches of the secondary bronchi that go deep into the small sections of the lung, they continue to get smaller [I E BRONCHIOLES - microscopic branches of segmentals, great air resistance here <_”"""_-K 1‘? €548 cxdncuugu 230%“ #12... E. Cl C TERMINAL BRONCHIOLES - smaller yet in size, very thin walls at this point D E RESPIRATORY BRONCHIOLES — very thin walls beginning to be ounded by the respiratory capillary beds, gas exchange can begin to occur at this level ‘ ‘ fl ALVEOLAR DUCTS — small extension of above leading to the sacs of alveoli (the major respiration areas ALVEOLAR SACS - groups of alveoli surrounding the alveolar ducts, sacs are surrounded by a capillary bed 7 ”l ALVEOLI - the deepest of all air passageways, each individual alveoli is one cell thick surrounded by a capillary bed, it makes for easy gas exchange El 3 NOTE: Gas exchange begins to take place in the respiratog bronchioles and smaller subdivisions, not in the larger ones. LUNGS E] El Two cone shaped, sac-like structures located in the thorax ...
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