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Tuesday, May 14, 2019

TLMweb® 10TH CLASS BIOLOGY Male reproductive system - పురుషప్రత్యుత్పత్తి


TLMweb® 10TH CLASS BIOLOGY Male reproductive system - పురుషప్రత్యుత్పత్తి

Human male reproductive system consists of a pair of testes which are embedded in scrotal sacs. Testes produce millions of spermatozoané during copulation. Each testis possesses many lobules. Each lobule has highly coiled minute tubules. They are called seminiferous tubules. Vasdeferens collects spermatozoans from seminiferous tubules. Vasdeferens continues as epididymis in which spermatozoans are temporarily stored. Spermatozoans are released outside through urethra. In humans, both of these organs are outside the abdominal cavity. Having the testes outside the abdomen facilitates temperature regulation of the sperm, which require specific temperatures to survive about 2-3 °C less than the normal body temperature i.e. 37 °C. In particular, the extra peritoneal location of the testes may result in a 2-fold reduction in the heat-induced contribution to the spontaneous mutation rate in male germinal tissues compared to tissues at 37 °C. If the testicles remain too close to the body, it is likely that the increase in temperature will harm the spermatozoa formation, making conception more difficult. This is why the testes are carried in an external pouch viz. scrotum rather than within the abdomen; they normally remain slightly cooler than body temperature, facilitating sperm production.


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