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Changes in blood levels of nutrients or ions that trigger hormone release are stimuli that are:

AHazardous
BHorizontal
CHumoral
DHabitual
Answer & Solution
Correct answer: C. Humoral
1. The trigger is a non-hormone chemical in the blood. 2. Its level rising or falling drives the response. 3. Those are humoral stimuli. _Source: OpenStax Anatomy and Physiology 2e, Chapter 17, The Endocrine System._
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