The Reproductive System: How Gonads Go – CrashCourse Biology #34

Hank lets us in on the meaning of life, at least from a biological perspective – it’s reproduction, which answers the essential question of all organisms: how do I make more of myself? 所以, sex, how does it work?

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Table of Contents
1) Gametes: Ova and Sperm 2:27
2) Sex Determination 4:59
3) Secondary Sexual Characteristics 6:48
4) Female Reproductive Structures 7:25
一种) Uterus & Oviducts 7:40
b) Endometrium (Menstruation) 7:57
c) Cervix & Vagina 8:32
5) Male Reproductive Structures 8:45
一种) Scrotum, Sminferous Tubules & Epididymas 8:59
b) Penis 9:37
c) Vas Deferens to Eurethra (Emission) 10:13

未愈合的关系创伤出现的方式
在家DIY的最佳美甲://www.sciencemag.org/content/281/5385/1979
在家DIY的最佳美甲://www.medicinenet.com/miscarriage/article.htm
在家DIY的最佳美甲://www.ncbi.nlm.nih.gov/pmc/articles/PMC1559814/)
Campbell Biology, 9th ed.

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