KINE 1P90 Lecture Notes - Lecture 21: Secondary Sex Characteristic, Sex Steroid, Oogonium
31 Mar 2016
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Transport of sperm and ovum to common site for union (concepion) Ater 1st 2 months of intrauterine development embryo is known as fetus. Maintenance of developing fetus unil it can survive outside world (formaion of placenta) Nourishing infant ater birth by milk producion (lactaion) Secret female sex hormone: estrogen, which is essenial for ova maturaion and release, establishment of female secondary sexual characterisics. Contributes to breast development in anicipaion of lactaion. Progesterone: preps environment for nourishing fetus and contributes to ability to produce milk. At puberty (12 years) hypothalamic gonadotropin-releasing hormone acivity increases for 1st ime. Simulates release of anterior pituitary gonadotropin hormones (lh & fsh) Release of estrogen which induces growth and maturaion of reproducive tract and secondary sex characterisics. But female reproducion system comes into being long before puberty. Idenical steps of chromosome replicaion and division during gamete producion in both sexes. The undiferenial primordial germ cells in fetal ovaries, the oogonia.
