Human Foetus Inside Womb
Human Embryo At 6 Weeks' Gestation
Male Reproductive System (labelled)
Male Reproductive System (unlabelled)
Female Reproductive System (labelled)
Female Reproductive System (unlabelled)
Sperm. From puberty onwards the testis produce 1500 per second.
Each one lives for 72 days, and over the first three weeks it develops the ability to swim.
Sperm are ejaculated into the vagina mixed with a seminal fluid. Together these are known as semen.
Semen contains alkaline substances to combat the acid ...
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