Presentation on theme: "The Male Reproductive System"— Presentation transcript:
1 The Male Reproductive System REMEMBER from Genetics?... sperm (gamete) + egg (gamete) zygotetestosterone - male sex hormone produced by the interstitial cells of the testes.Testosterone stimulates spermatogenesisspermatogenesis - process by which spermatogonia divide and differentiate into mature sperm cells (meiosis)gonatotropic hormones - hormones produced by the pituitary gland that regulate the functions of the testes in males and the ovaries in females.LH luteinizing hormoneFSH follicle stimulating hormonefertilization
4 The Male Reproductive System Gonadotropic hormones: Made by pituitary glandfollicle-stimulating hormone (FSH) - in males, hormone that increases sperm production.luteinizing hormone (LH) - in males, hormone that regulates the production of testosterone.gonadotropin-releasing hormone (GnRH) - chemical messenger from the hypothalamus that stimulates secretions of FSH and LH from the pituitary.
5 The Male Reproductive System High levels of testosteroneDetected by hypothalamus,Negative feedbackInhibits LH production byStopping release of GnRHInhibin produced bySertoli cells,Feeds back to pituitary andHypothalamus (not wellunderstood)LH stimulates interstitialCells to produceTestosterone.Testosterone increasesSperm production
6 The Female Reproductive System Ovaries produce progesteroneAnd estrogen
8 The Female Reproductive System follicles - structures in the ovary that contain the egg and secrete estrogenPrimary oocyte matures into ovum (egg)Granulosa cells provide nutrients for oocyteovulation - release of the egg from the follicle held within the ovary.corpus luteum - a mass of follicle cells that forms within the ovary after ovulation; secretes estrogen and progesterone.
9 The Female Reproductive System Ovarian hormones:estrogen - female sex hormone that activates the development of female secondary sex characteristics, including development of the breasts and body hair, and increased thickening of the endometrium (lining of uterus).progesterone - female sex hormone produced by the ovaries that maintains uterine lining during pregnancy.
11 The Female Reproductive System Estrogen secreted, increasesLining of endometrium
12 The Female Reproductive System Gonadotropic Hormones:follicle-stimulating hormone (FSH) - in females, a gonadotropin that promotes the development of the follicles in the ovary.luteinizing hormone (LH) - in females, a gonadotropin that promotes ovulation and the formation of the corpus luteum.