NPB 10 Lecture Notes - Lecture 16: Endometrium, Uterus, Ovulation
23 Jan 2018
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In testes, meiosis yield haploid (23 chromosomes) sperm: spermatogenesis development of sperm from spermatogonium to spermatozoans, spermatogonium (46 chromosomes) undergoes meiotic division (cid:894)(cid:862)crossi(cid:374)g over(cid:863)(cid:895) a(cid:374)d this results in four functional spermatozoans, which are haploids. About 60-65 days: producing 150-200 million sperm/day, male ejaculate about 1. 5-5 ml, which is about 200-250 million. Infertile is less than 20 million/ejaculate: mature at temp. less than body temp. which is about 90 -94 f (tb = 98. 6 f), entire life males are fertile. Testis site of spermatogenesis and maturation: size of a thumb or half a walnut, testosterone production done by leydig cells. Urethra: connects to bladder, shared pathway b/w renal system and sexual reproductive organs, during ejaculation urine does not come out. Semen: fuel (fructose, mucus semen can swim in this, hco3, prostaglandins causes the musculature of the female reproductive to contract. (bicarbonate) i(cid:373)porta(cid:374)t to (cid:374)eutralize the acidity i(cid:374) the vagi(cid:374)a so the se(cid:373)e(cid:374) does(cid:374)"t die.
