An 81-year-old male patient who has a diagnosis of orthostatic hypotension is experiencing an episode of particularly low blood pressure
The man's body has responded by increasing levels of angiotensin II in the bloodstream, a hormone that decreases the glomerular filtration rate in the kidneys and contributes to an increase in blood pressure. Which of the following phenomena best describes what has occurred?
A)
Positive feedback
B)
Adaptation
C)
Negative feedback
D)
Homeostasis
Ans:
C
Feedback:
his regulation and attempt to normalize blood pressure are an example of a negative feedback mechanism, in which physiological processes result in the maintenance of homeostasis. This process of normalization is not an example of positive feedback, and homeostasis is the goal rather than the process. This process involves adaptation, but negative feedback is a more precise characterization of the process.
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