primary male sex hormone, stimulates development of primary sexual characteristics and secondary sexual characteristics
primary sexual characteristics
testes, scrotum, penis, vas deferens, glands, etc.
secondary sexual characteristics
deeper voice, enlarged thyroid cartilage, high hair chest, legs, arm, facial hair. high muscle mass, high height (skeletal growth), baldness.
gonads. produce sex hormones, estrogens, progesterone, produce sex cells oocytes
production of oocytes, begins in fetal development, in utero.
stem cells, rapid cell division, oogonia becomes primary oocytes
surrounded by a layer of cells (granulosa cells). primordial follicle. all primary oocytes enters meiosis I and stall. then birth of girl.
2 million primary oocyte
starts at puberty. 28 days, regulated by hormones. at beginning of each cycle a few primary oocytes continue to develop, usually only one finishes meiosis I. and becomes secondary oocyte and first polar body.
in mature follicle. stalls midway of meiosis II. contains zona pellucida, corona radiata which protect it. is released from mature follicle at ovulation.
several layers of granulosa cells.
oocyte is viable for 12-24 hours if no sperm present. ruptured follicle converts into corpus luteum.