Growth Time
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Aging of the Lungs While the number of bronchi one has at birth is the same as the number in old age, the number of alveoli increases till the age of about 8 years. Thereafter the alveoli increase in size till about 18 years. As the lungs progress through age there is a mild, functionally insignificant increase in size. The respiratory bronchioles and alveolar ducts increase in size in middle age, but there is no destruction of the walls of the alveolar septa. Thus in old age there is mild increase in size of the lungs but without concomitant destruction of lung tissue that is seen in emphysema. There is glandular hypertrophy and progressive calcification of the cartilage of the medium sized bronchi. (London South Bank University) (http://myweb.lsbu.ac.uk/dirt/museum/p6-92.html) |
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