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A man is a male human. The term ''man'' is usually reserved for an adult male, with the term boy being the usual term for a male child or adolescent. However, the term ''man'' is also sometimes used to identify a male human, regardless of age, as in phrases such as "men's basketball". Like most other male mammals, a man's genome typically inherits an X chromosome from his mother and a Y chromosome from his father. The male fetus produces larger amounts of androgens and smaller amounts of estrogens than a female fetus. This difference in the relative amounts of these sex steroids is largely responsible for the physiological differences that distinguish men from women. During puberty, hormones which stimulate androgen production result in the development of secondary sexual characteristics, thus exhibiting greater differences between the sexes. However, there are exceptions to the above for some intersex and transgender men. ==Etymology== (詳細はEnglish term "man" is derived from a Proto-Indo-European root '' *man-'' (see Sanskrit/Avestan ''manu-'', Slavic ''mǫž'' "man, male").〔''American Heritage Dictionary'', Appendix I: Indo-European Roots. (man-1 ). Accessed 2007-07-22.〕 More directly, the word derives from Old English ''mann.'' The Old English form had a default meaning of "adult male" (which was the exclusive meaning of ''wer''), though it could also signify a person of unspecified gender. The closely related Old English pronoun ''man'' was used just as it is in Modern German to designate "one" (e. g., in the saying ''man muss mit den Wölfen heulen'').〔John Richard Clark Hall: A Concise Anglo-Saxon Dictionary〕 The Old English form is derived from Proto-Germanic '' *mannz'', "human being, person", which is also the etymon of German ''Mann'' "man, husband" and ''man'' "one" (pronoun), Old Norse ''maðr'', and Gothic ''manna''. According to Tacitus, the mythological progenitor of the Germanic tribes was called ''Mannus''. '' *Manus'' in Indo-European mythology was the first man, see Mannus, Manu (Hinduism). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Man」の詳細全文を読む スポンサード リンク
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