Reproduct Sys (Your Body) (Your Body: How It Works)
Language: English
Pages: 112
ISBN: 0791076296
Format: PDF / Kindle (mobi) / ePub
This book examines the development and changes that occur in the reproductive system of both sexes--from conception through puberty and adulthood.
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failed to exhibit appropriate female reproductive behaviors later in life. This gave rise to the concept of organizational effects: that early exposure to androgens permanently altered the developing brain, causing it to function in a masculine or defeminized manner as an adult. In males, absence of androgens will permanently alter the brain to be feminine or demasculinized. In other words, sexual differentiation of the nervous system (and subsequent behaviors) is directed by the same steroid
fallopian tubes (oviducts). A portion of the fallopian tube is removed and the severed ends ligated (tied). This effectively blocks the pathway that delivers the egg to the uterus. CH.YBW.Rep.C07.FinalN.q 12/20/06 11:26 AM Page 85 Concerns and Complications control pill. Birth control pills initiate and maintain a negative feedback loop by administering synthetic progesterone and estrogen in doses strong enough to inhibit the release of GnRH, LH, and FSH. In the absence of LH and FSH,
DISEASES Sexually transmitted diseases (STDs) can be spread by any form of sexual contact. This includes kissing, touching, anal, oral, and vaginal sex. Researchers suspect that the increase in STDs worldwide (Table 7.2) is the result of the 89 CH.YBW.Rep.C07.FinalN.q 90 12/20/06 11:26 AM Page 90 THE REPRODUCTIVE SYSTEM Table 7.2 The rates of STD incidences are on the rise. In 1999, over 85 million people were infected with an STD, according to the Centers for Disease Control and
superficial (outermost) part of the skin, lines blood vessels, hollow organs, and passages that lead externally from the body. Fallopian tubes Duct that transports ova from the ovary to the uterus. Also called uterine tube or oviduct. Feminization Acquiring female-like physiology and behaviors. When occurring in a male, these people are said to be demasculinized. Follicle stimulating hormone (FSH) Hormone secreted by the anterior pituitary gland that initiates development of ova and stimulates
CH.YBW.Rep.zBM.FinalN.q 12/20/06 11:31 AM Page 118 About the Author Randolph W. Krohmer received a B.A. in 1974 from Coe College, Cedar Rapids, Iowa, with a major in biology and a certificate in secondary education. After teaching high school biology for three years, Dr. Krohmer entered the master’s program at Saint Louis University, receiving an M.S. in biology in 1980. After a year as the Supervisor/ Instructor of Histology at the SLU Medical School, he entered the Ph.D. program at SLU,
