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involution |
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involution [‚in·və′lü·shən] (biology) A turning or rolling in. (embryology) Gastrulation by ingrowth of blastomeres around the dorsal lip. (mathematics) Any transformation that is its own inverse. In particular, a correspondence between the points on a line that is its own inverse, given algebraically byx′ = (ax+b)/(cx-a), wherea2+bc≠ 0. A correspondence between the lines passing through a given point on a plane such that corresponding lines pass through corresponding points of an involution of points on a line. (medicine) The retrogressive change to their normal condition that organs undergo after fulfilling their functional purposes, as the uterus after pregnancy. The period of regression or the processes of decline or decay which occur in the human constitution after middle life. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| This is true for both genders, but is particularly the case for women after menopause, when hormonal deprivation adds considerably to involutional bone loss. Physical exercise as prophylaxis against involutional vertebral bone loss: a controlled trial. Physical exercise as a prophylaxis against involutional vertebral bone loss: a controlled trial. |
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