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Is a gland defined by a visible morphology, or is anything that secretes a hormone a gland?

The answer does matter for the definition of histamine. Based on the answer I can conclude whether it's an hormone or not.

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  • $\begingroup$ Glands can be classified as endocrines or exocrines, and only endocrine glands secrete hormones. Thus, not all glands secrete hormones. Regarding your second paragraph ("The answer does matter for the definition of histamine. Based on the answer I can conclude whether it's an hormone or not.") I have absolutely no idea at all of what you tried to say here. $\endgroup$ – user24284 May 25 '17 at 7:33
  • $\begingroup$ Thank you for your notes. Maybe I didn't explain myself well, so it would be better to see the place that the question came from... (kindly, look at "Wnt" things) en.wikipedia.org/wiki/Wikipedia:Reference_desk/… $\endgroup$ – Alleged Biologist May 25 '17 at 17:04
  • $\begingroup$ Now I understand your question. You could actually go directly to the point, asking this in the title: "Is histamine an hormone or not?". $\endgroup$ – user24284 May 26 '17 at 10:09

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