Biology / Unit 4 Bio 0769 short lesson, about 20 seconds
Endocrine Signaling
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The idea
Endocrine signaling releases hormones into the bloodstream from endocrine cells, producing a slower but longer-lasting response in distant target cells.
In practice
The thyroid gland releases hormones that travel the bloodstream to reach target cells throughout the body, diluted along the way.
Where people slip
A hormone's low circulating concentration is a consequence of blood dilution, not a sign the signal is weak.
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