BIOS 252 Week 7 Lab; Endocrine System

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 an 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 an estrogen. When the product reaches a certain level in thebloodstream,itsignalstothehypothalamusandanteriorpituitarytostopfurtherrelease of the stimulating hormone or neurotransmitter and thereby leading to reduced levels of the product. Apositivefeedbackloopisanoppositeloop.Aproductsignalstoproducemoreofthe stimulating hormone or neurotransmitter which causes a continuous increase of the product. Can we control hormones? In this simulation, you will learn about 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? (2points) 2. Data: (2 points; ½ pointeach) 3. What is the importance of a having a control in an experiment? (2points) 4. What effect does an increase in GnRH release from the hypothalamus haveon the pituitary? (2points) 5. a. Which of the hormones tested would likely decrease fertility in females?(2 points)b. Which of the hormones tested would likely decrease fertility in males? (1 point) 6. Why might testosterone not be an ideal contraceptive choice for females?(2 points) 7. Discuss an example of a negative hormonal feedback mechanism other than those involving the reproductive system. (2points)