final lab fillll

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Gwinnett Technical College *

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2117

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Biology

Date

Jan 9, 2024

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docx

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4

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Week 7 Endocrine System Lab Learning Objectives: Understand hormonal feedback mechanisms Introduction: The body uses a variety of mechanisms to keep hormone levels tightly regulated. A critical mechanism is using feedback loops in which a hormone, such as estrogen, feeds back to control its own production. This can be either a positive or a negative feedback loop. In a negative feedback loop, a stimulus, such as a hormone or a neurotransmitter, causes the release of a product, such as estrogen. When the product reaches a certain level in the bloodstream, it signals to the hypothalamus and anterior pituitary to stops further release of the stimulating hormone or neurotransmitter and thereby leads to reduced levels of the product. A positive feedback loop is the opposite loop. A product signals to produce more of the stimulating hormone or neurotransmitter which causes a continuous increase of the product. Can we control hormones? In this simulation you will learn different hormones’ influence on fertility. We will perform animal friendly virtual experiments on some beautiful bunnies to try to keep the petting zoo population from getting out of control! Assignment: Part 1 Complete the Labster " Endocrinology: Learn how contraceptives work” Have the lab report with you as you go through the lab to record data. The theory section is a helpful resource. Part 2 Complete the lab report
Endocrine System Lab Report 1. What hormones were used in the fertility experiments? (2 points) Testosterone, Progesterone, and GnRH. 2. Data: (2 points; ½ point each) Endometrial thickness (0-6) Control 6 GnRH 4 Progesterone 0 Testosterone 0 3. What is the importance of a having a control in an experiment? (2 points) With the exception of the variable under test, a control group is made up of exactly the same components as the experimental group. 4. What effect does an increase in GnRH release from the hypothalamus have on the pituitary? (2 points) The anterior pituitary glands will be stimulated more when the hypothalamus produces more GnRH, and this will result in a spike in the release of FSH (follicle stimulating hormone) and LH (luteinizing hormone). 5. a. Which of the hormones tested would likely decrease fertility in females? (2 points) High testosterone levels, which are typically associated with PCOS, have a number of negative health implications, including infertility. b. Which of the hormones tested would likely decrease fertility in males? (1 point) Male infertility can result from testosterone therapy because it reduces the production of FSH, which is necessary to encourage the development of sperm.
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