The Human Body and Endocrine System

M4 Written Assignment: due November 1

Answering each assigned question in 2 to 3 complete, and well written paragraphs is a requirement. This will give your professor a clear view of the concepts, facts, and themes that you are understanding and what you still need to work on.

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You are required to answer each written assignment questions in several (2- 3 or more), well-written, thoughtful paragraphs, IN YOUR OWN WORDS_(new window) If you find it especially difficult to rephrase technical and scientific material, you are not alone. Ask your professor for help.

The questions in the written assignments were purposely created to encourage you to think, make connections, and apply what you have learned. Most of the answers will not be found word for word in the text or the commentaries. This is deliberate – to help you learn to think through and interpret new information. Do your best with them and ask for help if you find yourself stumped or spending unreasonable or unprofitable amounts of time on them. There is very little if anything to be gained educationally from spending inordinate or inappropriate amounts of time on one question or another. Ask your instructor a question any time you find yourself frustrated, panicked, or overwhelmed.

Answering assigned questions in 2 to 3 complete, well written paragraphs will give your instructor a clear view of the concepts, facts, and themes that you are understanding and what you still need to work on. Please review the college’s policy on academic integrity_(new window) and let us know if you have any questions.

Please don’t hesitate to ask a question (click below) about these questions. You may want to read these questions before reading commentaries and the text, as well as afterwards, to highlight what is considered important and what we hope for you to take away.


Question 1 (5 points)

During breastfeeding, the stimulus of the baby sucking on the nipple increases the amount of milk produced by the mother. The more sucking, the more milk is usually produced. Is this an example of negative or positive feedback? Explain your answer. What do you think might be the evolutionary benefit of the milk production regulation mechanism you described?

Question 2 (5 points)

The level of a sex hormone, testosterone (T), is controlled by negative feedback. Another hormone, gonadotropin-releasing hormone (GnRH), is released by the hypothalamus of the brain, which triggers the pituitary gland to release luteinizing hormone (LH). LH stimulates the gonads to produce T. When there is too much T in the bloodstream, it feeds back on the hypothalamus, causing it to produce less GnRH. While this does not describe all the feedback loops involved in regulating T, answer the following questions about this particular feedback loop.

a. What is the stimulus in this system? Explain your answer.

b. What is the control center in this system? Explain your answer.

c. In this system, is the pituitary considered the stimulus, sensor, control center, or effector? Explain your answer.

Question 3 (5 points)

What are the differences between a neurotransmitter receptor and a sensory receptor? Give two (2) examples of each to illustrate these differences.

Question 4 (5 points)

a.Define hyposecretion and give an example of an endocrine disorder involving hyposecretion. Be sure to include the name of the hormone involved.

b.Define hypersecretion and give an example of an endocrine disorder involving hypersecretion. Be sure to include the name of the hormone involved.

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