PSL201Y1 Lecture Notes - Lecture 12: Actin, Libido, Ultrastructure
Document Summary
Endocrine 7: overview of reproduction and male reproductive system (textbook: pages 632-634, 638-644) Functions of reproductive system: commonalities among males and females. Textbook definitions: gametes (gam-eets) cells of reproductio(cid:374) produced i(cid:374) (cid:373)eiosis that co(cid:374)tai(cid:374) half of a perso(cid:374)"s ge(cid:374)etic material; examples are sperm cells in males and ova in females. Other sources: a mature haploid male or female germ cell that is able to unite with another of the opposite sex in sexual reproduction to form a zygote: females. Hormonal control of reproduction: hypothalamic-pituitary-gonadal axis: gnrh = gonadotropin-realeasing hormone, lh = luteinizing hormone, fsh = follicle stimulating hormone. Gonadal steroid feedback modulates gnrh and gonadotropin (lh, fsh) secretion. Gametogenesis in males and females: formation of gametes with 23 chromosomes from germ cells expressing 46 chromosomes. Germ cells in males and females undergo mitotic divisions to increase in number: mitosis = normal cell division. Cells divide once to produce identical cells: formation of gametes involves meiosis.
