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17.4 The Thyroid Gland
Homeostasis and Feedback - Biology LibreTexts
Module 10 Lab Worksheet: Endocrine System lab report and essay assignment papers and questions. Hormones, produced by endocrine glands, are secreted directly into the blood stream, travel throughout the body and influence the actions and activity of various cells. If a cell has a specific hormone, it is referred to as a target cell. Once a cell binds a hormone through its receptor, the response and impact of that hormone can vary greatly. Some hormones have an almost instantaneous effect on that cell such as epinephrine, aka- adrenaline to an effect that can last days to even months such as growth hormone. Hormonal levels are maintained by a negative feedback mechanism. As hormonal levels rise in the blood and affect the target cells, it causes a negative feedback loop to initiate the inhibition of further hormone production and secretion from its endocrine gland.
10.7: Homeostasis and Feedback
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Although many women would suspect pregnancy if their period was late, Gabrielle has not been sexually active. Ever since her first period at 13 years of age, her cycle lengths have varied greatly, and there are months where she does not get a period at all. She decides to go to the student health center on her college campus to get it checked out. The doctor asks her about the timing of her menstrual periods and performs a pelvic exam. She also notices that Gabrielle is overweight, has acne, and excess facial hair.