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Human Sexuality Chapter 3

by: Emily Goff

Human Sexuality Chapter 3 psych

Marketplace > Clemson University > psych > Human Sexuality Chapter 3
Emily Goff
GPA 3.5

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these in-depth notes cover chapter 3
Human Sexual Behavior
Bruce Michael King
Class Notes
Psychology, human sexuality
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This 3 page Class Notes was uploaded by Emily Goff on Friday January 29, 2016. The Class Notes belongs to psych at Clemson University taught by Bruce Michael King in Spring 2016. Since its upload, it has received 29 views.

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Date Created: 01/29/16
Human Sexuality Chapter 3- Hormones and Sexuality Hormones . Chemical substances that are secreted by ductless glands into the bloodstream. They are carried in the blood to other parts of the body, where they exert their effects on other glands or target organs. Endocrine System . A network of ductless glands that secrete their chemical substances, called hormones, directly into the bloodstream, where they are carried to other parts of the body to exert their effects. o Testicles created testosterone and small amounts of estrogen o Ovaries create estrogen and progesterone, as well as small amounts of testosterone The Pituitary Gland . Causes the testicles and ovaries to produce hormones o Releases eight different hormones into the bloodstream- 2 gonadotropins § First gonadotropic: follicle stimulating hormone (FSH)- stimulates the maturation of a follicle (immature egg) in one of the ovaries, and stimulates the production of sperm in men § Second gonadotropic: luteinizing hormone (LH)- causes ovulation (release of egg) in women and stimulates testicles to produce male hormones The Menstrual Cycle: the monthly cycle of hormonal events in a woman that leads to ovulation and menstruation . Average length of a menstrual cycle is 28 days . Preovuatory phase o Pituitary gland secretes high levels of FSH, which stimulates the development of a follicle in the ovary. o The growing follicle becomes a temporary endocrine gland and secretes higher levels of estrogen o Estrogen is carried in the bloodstream back to the brain where it inhibits the further release of FSH. o Estrogen also stimulates the release of LH (LH surge) . Ovulation: the expulsion of an egg in one of the ovaries o LH surge signals the onset of ovulation within 12-24 hours o Mature follicle has moved to surface of the ovary o At ovulation, the follicle ruptures and the ripe ovum is expelled into the abdominal cavity, where it is soon picked up by a fallopian tube o The cells that had surround the ovum in the follicle remain in the ovary and now are called Corpus Luteum § Corpus luteum begin to secrete progesterone in large quantities in the postovulatory stage o For a woman to get pregnant, an egg and sperm must be present. An egg remains ripe for only 24 hours, but sperm can live in a fallopian tube for up to five days. Thus, the fertile period for women is 5 days before ovulation and 1 day afterwards . Postovulatory Phase o Corpus luteum secrete large levels of progesterone and estrogen § Progesterone inhibits further release of LH from pituitary and further prepares the thickened endometrium in case the egg is fertilized § If the egg is fertilized by a sperm, it continues its trip through the fallopian tube and implants itself in the endometrium o Most of the time, fertilization does not occur, and in the absence of implantation, the corpus luteum degenerates. When this happens, there is a sharp decline in estrogen and progesterone . Menstruation: the discharge of sloughed off endometrial tissue, cervical mucus, and blood o With decline of levels of estrogen and progesterone, there is loss of the hormones that were responsible for the development and maintenance of the endometrium. o The endometrium is sloughed off and shed over a 3-6-day period o The loss of estrogen (which was inhibiting the release of FSH), also results in the pituitary gland once again secreting FSH, and a new cycle begins. Are there periods in the menstrual cycle when women are more interested in sex? At the time of ovulation, but no dramatic increase. Historical Perspectives about Menstruation . Biblical Hebrews regarded a menstruating woman as “unclean” . Roman Empire regarded touching a woman who was menstruating as very negative, “contact with it turns new wine sour” Views today about Menstruation . Most men and women do not have sex while the woman is on her period . Men particularly have very negative views about menstruation . Most men will not even buy tampons for their girlfriend Amenorrhea: the absence of menstruation for 3 months or longer PMS: premenstrual syndrome . 2-14 days before menstruation starts . interaction between serotonin (chemical in the brain) and estrogen and progesterone . caffeine makes it worse . large majority of mood changes in women are not due to PMS o if it is PMS, the mood changes end with the start of menstruation Dysmenorrhea . pain during menstruation . caused by prostaglandins- substances that cause contractions of the uterus Toxic Shock Syndrome (TSS) . caused by toxins produced by a bacterium. . The bacterium needs oxygen to multiply, and the air pockets in tampons contain oxygen Male hormones . Pituitary releases FSH- stimulates the production of sperm sine men don’t have eggs . LH stimulates the production of testosterone . Older men can take testosterone to increase sex drive o Women need some testosterone in their bodies to have sex drive, however they cannot take more testosterone to boost sex drive o When women lose sex drive, it is due to relationship problems, not loss of testosterone Which hormone is most important for women’s sexual desire: testosterone Steroid Use . Very dangerous- leads to loss of emotion control ('roid rage)


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