排序方式: 共有11条查询结果,搜索用时 46 毫秒
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药理学证明对氯苯异丙胺(PCA)释放5-羟色胺(5-HT)和儿茶酚胺。可调节PCA的某些行为效应,例如提高运动能力、定型行为和唾液分泌。Humphries等观察到PCA诱导大鼠射精。在没有可接受的雌性大鼠存在的情况下,PCA注射后30分钟内雄性大鼠也可射精。这些结果表明5-HT在这个效应中起到了一定作用。 相似文献
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A research on the relationship between ejaculation and serum testosterone level in men 总被引:2,自引:0,他引:2
The purpose of this study is to gain understanding of the relationship between ejaculation and serum testosterone level in men. The serum testosterone concentrations of 28 volunteers were investigated daily during abstinence periods after ejaculation for two phases. The authors found that the fluctuations of testosterone levels from the 2nd to 5th day of abstinence were minimal. On the 7th day of abstinence, however, a clear peak of serum testosterone appeared, reaching 145.7% of the baseline ( P < 0.01). No regular fluctuation was observed following continuous abstinence after the peak. Ejaculation is the precondition and beginning of the special periodic serum testosterone level variations, which would not occur without ejaculation. The results showed that ejaculation-caused variations were characterized by a peak on the 7th day of abstinence; and that the effective time of an ejaculation is 7 days minimum. These data are the first to document the phenomenon of the periodic change in serum testosterone level; the correlation between ejaculation and periodic change in the serum testosterone level, and the pattern and characteristics of the periodic change. 相似文献
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“体外射精就不会怀孕”.这在网络上被称为男性迷惑女性的最经典谎言之一。事实上,体外射精不但会给女性带来意外怀孕的伤害。对男性的健康也是有百害无一利的。采取体外射精的做法对男性心理和生理都存在着潜在的危害。 相似文献
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黄腹角雉(Tragopan caboti)的人工授精研究 总被引:3,自引:1,他引:3
不同年龄黄腹角雉的射精量存在显著差异(P<0.05),3~8岁为其繁殖壮年期;同一年龄的黄腹角雉在繁殖的不同时期,射精量也存在很大的差异,3月下旬至5月上旬为笼养下黄腹角雉的精子生成的高峰时期.从保证角雉安全和获取更多的精子等方面考虑,较为适宜的采精频率为1次*(3d)-1.利用稀释的精液和用原精液输精,黄腹角雉卵的受精率没有显著差异.黄腹角雉精子在雌体内的最长贮存时间为23d.通过对黄腹角雉产精的特点以及对精液的系统分析后,所建立的人工授精技术使卵受精率可达85%以上,解决了长期笼养下的黄腹角雉卵受精率低的问题. 相似文献
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精子虽小,却有极大的穿越能力。它能穿透宫颈黏液.一直游进女性的输卵管。一个健康的成年男性,每次射精能产生上亿个精子。但并非每个精子都“骁勇善战”。“精子数量惊人,却生命脆弱。”中国中医科学院西苑医院男科郭军主任医师介绍说, 相似文献