A guy thing."Brain Gain: Constant sprouting of neurons attracts scientists, drugmakers" (SN: 6/16/07, p. 376) states, "Exercise, estrogen, [and more examples] all rev up Verb 1. rev up - speed up; "let's rev up production" step up increase - make bigger or more; "The boss finally increased her salary"; "The university increased the number of students it admitted" 2. production of new brain cells." I am compelled to ask: If estrogen leads to neurogenesis neurogenesis /neu·ro·gen·e·sis/ (-jen´e-sis) the development of nervous tissue. neu·ro·gen·e·sis n. Formation of nervous tissue. neurogenesis the development of nervous tissue. , does the "male" hormone testosterone testosterone (tĕstŏs`tərōn), principal androgen, or male sex hormone. One of the group of compounds known as anabolic steroids, testosterone is secreted by the testes (see testis) but is also synthesized in small quantities in the also? JAIME HUNTER, MESQUITE, TEXAS Mesquite is a suburb of Dallas located in Dallas County and Kaufman County, Texas (USA). The city had a total population of 124,523 in the 2000 census which increased to 129,902 in the 2005 census estimate. There's good evidence that testosterone increases neurogenesis in songbirds but little evidence that it does the same in mammals.--B. VASTAG |
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