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Reproductive System part 3 Sex & Fertilization Crash Course A&P 42

By Crash Course Anatomy & PhysiologyFrom boclips.com
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After weeks of discussion of human reproduction, today we arrive at the main event: THE SEX. Hank explains the four phases of the human sexual response, how a sperm finds and fertilizes an egg, creating a zygote, and how different types of contraception work to prevent that from happening.

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