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Hormones can be classified by they are secreted directly into the blood stream, whether they are secreted via a duct, how far they travel and what cells they stimulate. For example, exocrine hormones are secreted into a duct and usually travel far to stimulate distant cells.

Cells that release paracrine hormones secrete these hormones into the
Select Option general circulationadjacent cellular matrixbodily fluids
and these hormonal chemicals travel to a
Select Option distant sitelocal sitecell in a different speciesthe same secreting cell
to stimulate
Select Option receptorsblood vesselsion channelsautoreceptors
embedded in the membranes of other cells.
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