Editing Atrophy (section)

==Normal development==
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Examples of atrophy as part of normal development include shrinking and the involution of the [[thymus]] in early childhood, and the [[tonsil]]s in adolescence. In old age, effects include, but are not limited to, loss of teeth, hair, thinning of skin that creates wrinkles, weakening of muscles, loss of weight in organs and sluggish mental activity.<ref>{{cite book|title=Disease and Its Causes|year=1913|publisher=New York Henry Holt and Company London [[Williams and Norgate]] The University Press, Cambridge, U.S.|url= https://www.gutenberg.org/files/15283/15283-h/15283-h.htm#toc_5 |author=W. T. Councilman|chapter=Chapter Two}}</ref>