Physiology 2130 Lecture Notes - Lecture 14: Estriol, Corpus Luteum, Estrone
1 Mar 2017
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Function: pass on the genes of the individuals, maintain the species. Each cell in body contains 23 pairs of chromosomes (including a pair of sex chromosomes) The sex chromosomes: large x chromosomes and a smaller y chromosome, all eggs contain a x chromosome, sperm can carry either an x or a y. Sex of baby is determined at point of fertilization. If sperm carrying x chromosome penetrates the egg (always carries x) xx = female. If a sperm carrying y fertilizes the egg (always carrying x) xy= male. Aka mesonephric duct: 2) mullerian duct. Aka paramesonephric duct these structures will form either the male or female reproductive tracts. Developing the male embryo : at 6-7 weeks, presence of y chromosome causes the indifferent gonads to develop into testes. Developing the female embryo : at 9 weeks, the development of the xx chromsomes are activated and the ovaries develop. Once testes/ovaries are developed, next the reproductive tracts and external genitalia develop.
