Biology / Bio 0769 · Atom · ~20 seconds
Endocrine Signaling
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Endocrine signaling releases hormones into the bloodstream from endocrine cells, producing a slower but longer-lasting response in distant target cells.
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The thyroid gland releases hormones that travel the bloodstream to reach target cells throughout the body, diluted along the way.
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A hormone's low circulating concentration is a consequence of blood dilution, not a sign the signal is weak.
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