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                • 為什么傷口愈合時會覺得癢?

                  發表于2017年02月17日

                  人的皮膚分為多層,在表皮的最底層,有一層細胞叫生發層,這層細胞的生命力很強,能不斷地生長繁殖,表皮損傷的淺傷口,就是靠生發層長好的。在長好的過程中,由于傷口很淺,神經受不到什么刺激,也就不大會有癢的感覺,長好后也沒有傷疤。但是,范圍比較大... [ 閱讀全文 ]

                • 男人死了之后也可以留下后代嗎?

                  發表于2016年12月11日

                  男人死了之后也可以留下后代嗎? 死亡的判定基本上是依據心臟停止、呼吸停止、瞳孔放大這三個原則。在呼吸停止、腦 波停止后,啦實上心臟還會繼續跳動,甚至在心臟停止后,肌肉還會運作幾個小時,胃腸也 會繼續進行消化,人體細胞更能在心臟停止后存活20至30... [ 閱讀全文 ]

                • 男性比女性更易得骨質疏松癥嗎?

                  發表于2016年12月11日

                  男性比女性更易得骨質疏松癥嗎? 其實不然。男性體內的雌性激素水平不及女性的高,但是男性體內雄性激素的分泌十分 旺盛,而在維持骨質密度、保護骨骼方面,雄性激素起的作用與雌性激素大致相仿。 骨質疏松癥是-種骨質流失的癥狀,多發子中老年人群之中。如... [ 閱讀全文 ]

                • 孕婦會把部分免疫力遺傳給新生的嬰兒嗎?

                  發表于2016年12月11日

                  孕婦會把部分免疫力遺傳給新生的嬰兒嗎? 夢婦會把某些免疫力遺傳給自己的孩子。來自母親的抗體非常強大,能夠給予新生嬰兒 _長達兒個j-j的保護。 也士:因為有了來自母親的抗體保護.,新生兒接種麻搽疫苗的時間要推遲到出生9?15個 月以后,太早接種疫苗的話... [ 閱讀全文 ]

                • 為什么我們睡覺的時候會做夢?

                  發表于2016年12月11日

                  為什么我們睡覺的時候會做夢?大腦在做夢的時候都發生了哪些變化?在1952年之前,人們對此一無所知。大多數科學家都認為,跟它睡著的主人一樣,大腦在睡眠過程中沒有任何活動。 你真的了解自己的身體嗎后來一位美國芝加哥大學的畢業生-尤金?阿瑟林斯基,用腦... [ 閱讀全文 ]

                • 我們活著的時候是什么阻止我們腐爛的?

                  發表于2016年12月11日

                  我們活著的時候是什么阻止我們腐爛的? 在人體的免疫系統里有白細胞、抗體和抗氧化劑,當我們活著時它們存在并活躍于體內。 它們小僅僅在血液中工作,還在體內某些部位的其他細胞中工作。它們的任務是發現任何外來物質并消滅它。 一旦我們死后,我們機體的所... [ 閱讀全文 ]

                • 為什么說腦子越用越好使?

                  發表于2016年12月11日

                  科學家研究證明,人的大腦皮層大約有140億個神經細胞,神經細胞也叫“神經元”。有人計算過,人經常運用的腦神經細胞只不過10億多個,還有80%~90%的腦神經細胞沒動用。“生命在于運動”,這是生物界的一個普遍規律。勤于用腦的人,腦血管經常處于舒展的狀態... [ 閱讀全文 ]

                • 為什么眼睛能看到東西

                  發表于2016年12月11日

                  在人類眼球的最外面,是一層無色透明的角膜,如同照相機的鏡頭。 由于它經常受到淚水的沖洗,因此總顯得水汪汪的,一塵不染。眼球的中央有個小圓孔叫瞳孔,外界的光線通過它進入到眼球底部的視網膜上。照相機在拍攝時,根據光線的明暗,需要隨時調整光圈。瞳... [ 閱讀全文 ]

                • 為什么傷口碰到咸的東西會特別痛?

                  發表于2016年12月11日

                  皮膚很敏感,不僅表面有數不清的汗毛,就連微風吹動它都能感覺到,而且表皮下有非常豐富的神經纖維和各種各樣的感覺細胞,能感受觸覺、痛覺和溫覺。但是,神經纖維并不直接暴露在外,而是躲藏在皮膚里面。通常打一拳,捏一把,被打、被捏的那一部分皮膚會覺... [ 閱讀全文 ]

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