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Old 05-21-2011, 04:22 PM   #1
kxlfc1638
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Default 穿紧身裤对男孩的坏处

有些男青年,喜欢穿紧身裤,特别是透气性差、散热不好的化纤类“兜档裤”包裹着阴囊,让阴囊处于密闭状态, 空气不流通。长此以往,容易造成今后不育的不良后果,这不是危言耸听,是有科学根据的。

男性的性器官阴囊对外界温度的高低很敏感,无皮下脂肪而有丰富的汗腺,有助于散热。当外界温度低时,刺激肉 膜的平滑肌和提睾肌收缩,使睾丸位置升高,阴囊皮肤就紧缩成密密的皱褶,并回缩至会阴部,防止散热,有助于 保温。相反,在外界温度升高时,平滑肌和提睾肌松弛,睾丸下降,水宜生水杯,离开躯体,阴囊皮肤松弛,增大散热面积,有利于局部散热。此外,精索中的动脉缠绕在成束并行的静脉丛上, 血液在两套血管系统中,只隔着薄薄的血管壁而反向流动,形成一个逆流交换系统,静脉血不断把来自腹腔内的动 脉血热量带走,结果睾丸动脉的血温可比腹主动脉低5.2摄氏度。阴囊就是通过这几种机制来调节阴囊和睾丸内 温度的。

阴囊的这种本领对于人类繁衍子孙后代是很重要的,因为温度对睾丸生精过程有很大影响,阴囊内温度比机体内低 2摄氏度左右,是生精作用的最适温度。温度过高,生精过程就会出现障碍,甚至完全停止,同时睾酮的分泌也将 减少。上述任何一个环节出了故障都会因影响阴囊温度的调节而造成不育。

由此可见,男青年确实不宜穿紧身裤,所以广大的青年男性应该注意自己的穿衣了。
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