BHAN435 Lecture Notes - Lecture 9: Prostaglandin, Mating Plug, Baculum
28 Feb 2017
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Document Summary
Masculine dimensions: sperm, effects of sperm competition on evolution of the male reproductive system in males. Sperm composed of head, middle piece with mitochondria, and flagellum: overall length. No correlation between sperm length and body size. No correlation between sperm length and mating system or relative testes size: midpeice. Contains mitochondria which provide energy for sperm to swim. Bigger mid piece volume, the more mitochondria, the better mobility: variation in sperm. Polygyny or monogamy: accesory reproductive glands, ejaculate. Fluid is alkaline: protects sperm from acidic vagina. Supports lack of sperm competition in males: penis size and shape, 4 theories. Humans have extra long penis to get sperm closer to the cervix. Human penis is shaped to remove other males sperm in a female. 3. shaped to bring the female to orgasm which moves sperm faster. Serves as a display for females: dixon dismissing the theories. There is no evidence to support compared to other primates.
