Talk:Respiratory zone

Is it the respiratory zone of the lungs, the respiratory zone of the respiratory tract or the 'respiratory zone' of the respiratory system ??? Alec - U.K.

[[Category:I think it's just part of the respiratory tract. The following is an extract from a text book of mine and it goes on explaining the structure of the respiratory zone and only goes as far as alveoli. Looking at the text book "Human Anatomy & Physiology" by E.Marieb and K.Hoehn 8th ed. p. 815 of Ch 22 "The Respiratory System" it's got a section called Respiratory Zone Structures. Here it says: Defined by the presence of thin-walled air sacs called alveoli, the respiratory zone begins as the terminal bronchioles feed into respiratory bronchioles within the lung. Protruding from these smallest bronchioles are scattered alveoli. The respiratory bronchioles lead into winding alveolar ducts, whose walls consist of diffusely arranged rings of smooth muscle cells, connective tissue fibres, and outpocketing alveoli called alveolar sacs. The next paragraph says that alveolar sacs are not the same thing as alveoli - alveolar sacs are like the bunch of grapes whereas the alveoli are the individual grapes i.e. gas exchange occurs in the alveoli and not the alveolar sacs.]]

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Cheers.—cyberbot II  Talk to my owner :Online 11:17, 28 February 2016 (UTC)