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gonad
A gonad or sex gland or reproductive gland〔http://dictionary.reference.com/browse/sex+gland?r=66 〕 is an endocrine gland that produces the gametes (germ cells) of an organism. In the female of the species the reproductive cells are the egg cells, and in the male the reproductive cells are the sperm.〔http://www.macmillandictionary.com/dictionary/american/gonad 〕 The male gonad, the testicle, produces sperm in the form of spermatozoa. The female gonad, the ovary, produces egg cells. Both of these gametes, are haploid germ cells.
== Regulation ==
The gonads are controlled by luteinizing hormone and follicle-stimulating hormone, produced and secreted by gonadotropes in the anterior pituitary gland. This secretion is regulated by gonadotropin-releasing hormone produced in the hypothalamus.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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