Biology / Bio 2953 · Atom · ~20 seconds
Three Stimuli Triggering Hormone Release
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Endocrine glands release hormones in response to three stimulus types: humoral, from changing fluid composition; hormonal, from another hormone's signal; and neural, direct from the nerves.
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Rising blood glucose is a humoral stimulus triggering insulin; TSH triggering thyroid hormone release is hormonal.
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A gland can respond to more than one stimulus type — the adrenal medulla responds to neural stimuli, unlike most.