The hormone cortisol is secreted in a circadian rhythm, with the highest levels at breakfast time and lowest around midnight. Which statement is the most likely explanation of this observation? A) Negative feedback regulation of cortisol is overridden (cancelled) by environmental stimulation during the day. B) Cortisol is not homeostatically regulated. C) Cortisol is regulated by positive feedback during the night and negative feedback during the day. D) The homeostatic setpoint for cortisol varies over a 24-hour cycle.

The hormone cortisol is secreted in a circadian rhythm, with the highest levels at breakfast time and lowest around midnight. Which statement is the most likely explanation of this observation? A) Negative feedback regulation of cortisol is overridden (cancelled) by environmental stimulation during the day. B) Cortisol is not homeostatically regulated. C) Cortisol is regulated by positive feedback during the night and negative feedback during the day. D) The homeostatic setpoint for cortisol varies over a 24-hour cycle.

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter16: The Body's System

Section: Chapter Questions

Problem 5ACQ: Figure 16.14 Goiter, a disease caused by iodine deficiency, results in the inability of the thyroid...

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