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Osmoreceptors sense a rise in blood osmolarity and antidiuretic hormone is released. Which class of stimulus triggered that release?
AA neural stimulus
BA hormonal stimulus
CA feedback stimulus
DA humoral stimulus
Answer & Solution
Correct answer: D. A humoral stimulus
1. Humoral stimuli are changes in blood levels of non-hormone chemicals such as nutrients or ions.
2. Blood osmolarity is a measure of solute concentration, so a rise in it is a humoral change.
3. Hypothalamic osmoreceptors detect that change and prompt release of antidiuretic hormone.
4. A hormonal stimulus would need another hormone to be the trigger, and none is involved here.
5. A neural stimulus works through nerve impulses, as when sympathetic neurons drive the adrenal medulla.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 17 "The Endocrine System", section 17.2 Hormones_
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