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Slide 1 - This lesson will increase your knowledge of concepts covered in the following TEKS for biology: 3.c – Evaluate impact of research on scientific thought, society, and the environment 3.e – Evaluate models according to their adequacy in representing biological objects or events 3.f – Research and describe the history of biology and contribution of scientists 10.a – Interpret the functions of systems in organisms 10.b – Compare the interrelationships of organ systems to each other and to the body as a whole 11.a – Identify and describe the relationships between internal feedback mechanisms in the maintenance of homeostasis
Slide 2 - Previous Lesson Scientific Methodologies and Publication
Slide 3 - QUESTION: Why is the U.S. government still spending billions of dollars funding scientific research? Based on Nature, February 5, 2004.
Slide 4 - Today Advances in Biological Knowledge Immunology Evolution Ecology Knowledge Anatomy The unknown Is still greater than the known Molecular Biology and Genetics
Slide 5 - QUESTION: If you had to design a study to investigate the effects of a new drug on human health, what type of design would you use?
Slide 6 - Record results CONTROL GROUP The variable being tested is absent Record results EXPERIMENTAL GROUP The variable being tested is present Identity the variable which will test the hypothesis Two-group experimental design Compare and analyze the test results Report on experimental design, test results, and conclusions drawn from results Based on: Starr, C., Biology: Concepts and Applications, Brooks/Cole, Thomson Learning
Slide 7 - QUESTION: Why can nonscientists have confidence in the information published in the reputable popular press (Time Magazine, U.S. News & World Report, Newsweek)?
Slide 8 - Scientific Methodologies World knowledge in scientific journals Publication Rejection Peer review Submission of paper to scientific journal Observation Hypotheses Tests of hypotheses Results Reputable Popular Press
Slide 9 - Today’s Lesson Menopause and Hormone Replacement Therapy
Slide 10 - Overview of Lesson Female reproductive system and menstrual cycle Menopause Hormone replacement therapy Women’s Health Initiative
Slide 11 - Pathway of Egg if Unfertilized Follicle of ovary Oviduct Uterus Vagina
Slide 12 - Female System Based on:Mader, S., Inquiry Into Life, Wm. C. Brown Publishers
Slide 13 - Menstrual cycle: the cyclic buildup and breakdown of the endometrium as the uterus prepares monthly for a blastocyst
Slide 14 - Based on: Mader, S., Inquiry Into Life, McGraw-Hill Negative feedback Negative feedback Hormones and Menstrual Cycle
Slide 15 - Hypothalamus Pituitary Follicle Female sexuality Releasing hormone (GnRH) LH & FSH Egg Development Estrogen & Progesterone Overview Negative Feedback Negative Feedback & Homeostasis Negative feedback effects of estrogen and progesterone are the prime homeostatic mechanisms maintaining female sex characteristics at a relatively constant level
Slide 16 - Hormonal Regulation of Ovarian and Uterine Cycles Based on Mader, S., Inquiry, Wm. C. Brown Publishers
Slide 17 - (Graafian) follicle Based on: Mader, S., Inquiry Into Life, McGraw-Hill Ovulation
Slide 18 - Hormones and Menstrual Cycle Pituitary produces FSH and LH FSH and LH cause follicle to develop and release egg Follicle produces estrogen and progesterone Estrogen and progesterone thicken endometrium to prepare for implantation of fertilized egg and suppress production of FSH and LH Egg not fertilized Egg fertilized
Slide 19 - If the Egg is Fertilized Fertilized egg implants in endometrium Embryo sends out hormonal message to the old follicle (corpus luteum) to let it know an embryo is present Old follicle continues to produce estrogen and progesterone to maintain endometrium
Slide 20 - Based on: Mader, S., Inquiry Into Life, McGraw-Hill Human Development
Slide 21 - Based on Mader, S., Inquiry, Wm. C. Brown Publishers Family Planning Calendar
Slide 22 - If the Egg is Not Fertilized Unfertilized egg does not implant No hormonal message is sent to the old follicle and it stops production of estrogen and progesterone Without estrogen and progesterone, the endometrium breaks down and the menstrual flow occurs
Slide 23 - Uterine Cycle Hormonal Regulation of Ovarian and Uterine Cycles Based on Mader, S., Inquiry,Wm. C. Brown Publishers
Slide 24 - Overview of Lesson Female reproductive system and menstrual cycle Menopause Hormone replacement therapy Women’s Health Initiative
Slide 25 - Menopause In a woman’s 40s, estrogen production declines Symptoms of early menopause (perimenopause) appear and may last for 5 years Eventually estrogen production stops, menstrual cycle stops and woman enters menopause Average age to enter menopause is 51
Slide 26 - Symptoms of Early Menopause Hot flashes Dry skin Brittle hair Insomnia Vaginal dryness Mood swings
Slide 27 - Changing hormone levels with menopause The uneven rising and falling of hormone levels during perimenopause may be responsible for menstrual irregularities and other problems associated with menopause. Based on: Medical Essay: Supplement to Mayo Clinic Health Letter, October 1999
Slide 28 - Overview of Lesson Female reproductive system and menstrual cycle Menopause Hormone replacement therapy Women’s Health Initiative
Slide 29 - Early History of HRT In early 1900s, scientists used extracts from pig ovaries to treat menopausal women By the early 1940s estrogen was being produced from pregnant mares’ urine (Premarin) By 1960s, the recommendation was that every women over 50 begin to using HRT
Slide 30 - Estrogen Only Therapy Beginning in 1960s, estrogen only was given to treat women with symptoms of menopause By 1970s, realized that estrogen only therapy increased rate to uterine cancer
Slide 31 - Today’s Hormone Replacement Therapy Estrogen combined with progestin Lowers risk of uterine cancer
Slide 32 - Short-Term Benefits of HRT Cools hot flashes Combats insomnia Reduces vaginal dryness Levels mood swings
Slide 33 - Pre-2002 Hypothesized Long-Term Benefits of HRT Retards osteoporosis Reduces the risk of heart disease Neutralizes the risk of uterine cancer Reduces the risk of Alzheimer’s and colon cancer
Slide 34 - Osteoporosis: a bone thinning disease that sets the stage for serious fractures Based on: Newsweek Special Issue, Spring/Summer 1999
Slide 35 - MENOPAUSE AND BONE LOSS IN WOMEN Based on: A Harvard Woman Health Watch Special Report 1996
Slide 36 - MENOPAUSE AND BONE LOSS IN WOMEN Based on: A Harvard Woman Health Watch Special Report 1996
Slide 37 - THE HEART OF THE MATTER: annual deaths per 100,000 U.S. women Heart disease kills 6 times more women in their post-menopausal years than does breast cancer Based on: Harvard Health Letter, October 1997
Slide 38 - Hypothesized Long-Term Risks of HRT Promotes the formation of gallstones and blood clots Increases the risk of breast cancer
Slide 39 - Cancerous breast cells spread through the lymphatic and circulatory systems to other areas of the body. Lymphatic and Circulatory Systems Spread of Breast Cancer Based on: Campbell et al.’s Biology: Concepts & Connections, Benjamin Cummings
Slide 40 - Overview of Lesson Female reproductive system and menstrual cycle Menopause Hormone replacement therapy Women’s Health Initiative
Slide 41 - Before the Women’s Health Initiative Study, studies had shown a positive relationship between taking HRT and lower heart disease (a correlation). Why isn’t this type of correlative study used as proof that HRT reduces heart disease?
Slide 42 - Women who took HRT may have more financial resources, better health care and be more health conscious than women that didn’t use HRT. Researchers could not tell “whether hormones made women healthy-or whether healthy women were more likely to take hormones.” Correlation does not prove causation!
Slide 43 - Women’s Health Initiative Study began in 1993 and was to last 15 years Involved 67,000 in three random clinical trials (Dietary Modification, Calcium/Vitamin D supplements, and HRT) HRT trial involved 16,000 women to assess the pros and cons of estrogen-progestin therapy (half received HRT and half received placebo) HRT trial was stopped in July 2002 when health risks were discovered Other two trials were continued
Slide 44 - Women’s Health Initiative Women taking HRT increased risk of breast cancer, stroke, and heart disease decreased risk of hip fractures, colorectal cancer, and heart vessel disease (if taken early) Length of use may be a key factor
Slide 45 - But does HRT really result in significant health risks? Viewed as percentages: Heart attack rate was 29% higher in HRT group Stroke rate was 41% higher in HRT group Viewed as absolute numbers: Instead of 30 heart attacks per 10,000 women, 37 women would have heart attacks Instead of 21 strokes per 10,000 women, 29 women would have strokes Instead of 30 breast cancers per 10,000 women, 38 women would have breast cancer
Slide 46 - Health Advisories Health advisories are made from a population perspective Individuals must decide how to respond to health advisories from a personal perspective
Slide 47 - A Boost for Hormone Therapy 2007 Update New Eng Journal Med Younger post-menopausal women 50-59 yrs of age post hysterectomy (took estrogen alone) showed up to 40% less calcium-based plaque in heart arteries than placebo group
Slide 48 - Next Lesson Prostate Cancer
Slide 49 - Lymphatic System Based on: Mader, S., Inquiry into Life, Wm. C. Brown Publishers
Slide 50 - Back Circulatory System Based on: Mader, S., Inquiry Into Life, McGraw-Hill