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Posterior Pituitary Thyroid Regulatory Feedback Gonads Potpourri 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500 This hormone causes the direct reabsorbtion of water in the kidneys. Antidiuretic Hormone This hormone exhibits one of the only examples of positive feedback in the human body Oxytocin Where are the hormones of the posterior pituitary synthesized? The hormones of the posterior pituitary are synthesized in the hypothalamus Describe how the the posterior pituitary is stimulated to release it’s hormones. The hypothalamus and posterior pituitary are connected by special neurons and these neurons signal the relase of posterior pituitary hormones such as ADH and ocytocin Identify one stimulus for the secretion of ADH. Dehydration or low blood pressure DOUBLE JEOPARDY!!! Where is the thyroid gland located? In front of the larynx What is the function of thyroxine? Increases body metabolism What happens to TSH levels when Thyroxine levels rise in the bloodstream? TSH levels will decrease as a result of negative feedback. What characteristics would you expect to see in somebody who has hypothyroidism Hypothyroidism would results in an under-production of thyroxine and thus low metabolism = overweight, lethargic, cold etc. What would be the relative concentration of Calcitonin in the blood if levels of parathyroid hormone are high? Calcitonin would be low as they are antagonistic hormones Give one example of negative feedback Answers will vary High levels of thyroxine will cause a decrease in the secretion of what hormone? Increased thyroxine would cause a decrease in the amount of thyroid stimulating hormone (TSH) as a result of negative feedback. Gland #1 Hormone A Is released Uterine Contractions become more frequent Given the diagram above, what is going to happen to the level of hormone A in the bloodstream? Hormone A is oxytocin and thus will increase as a result of positive feedback. Gland #1 Hormone A Is released Gland #2 [Hormone B] increases (-) Based on this diagram, what is going to happen to levels of hormone A? Hormone A will decrease as hormone B increases as a result of negative feedback High levels of Gonadotropic Releasing Hormone (GnRH) would be caused by low levels of which hormones? Low levels of testosterone, estrogen, and progesterone would increase levels of GnRH which would in turn increase FSH and LH production and subsequently sex hormone production Testosterone contributes to male secondary sex characteristics. Name two of those characteristics. Any two of: Deep voice, muscle build, facial har, fat deposition etc. What is the primary role of progesterone in women? Progesterone’s primary function is to develop and maintain the uterine lining and prevent contractions From which endocrine gland is testosterone secreted? Testes Which pituitary gland hormone stimulates the production of testosterone, estrogen, and progesterone? Luteinizing Hormone stimulates the production of testosterone in males, and indirectly the production of progesterone and estrogen in females. Which two hormones stimulate the development of sperm? FSH & Testosterone From which part of the pituitary are TSH and ACTH secreted? Anterior Pituitary What is the difference between an exocrine gland an an edocrine gland? Exocrine = contains ducts and secretes outside the bloodstream Endocinre = into the bloodstream What is the difference between Prolactin and Oxytocin? Prolactin stimulates milk production in the mammary glands whereas oxytocin stimulates milk release in the mammary glands as well as uterine contractions What is the major difference between the Endocrine system and the Nervous System with respect to maintaining homeostasis? Endocrine system acts over longer durations while the nervous system acts over short durations Name both opposing teams for the basketball games tonight LSL & Sturgeon