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.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text: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.
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