Relating to the secretion or release of substances inside the body, especially referring to glands or cells that produce hormones into the bloodstream.
From Greek 'endo-' (inside) + Latin 'secretus' (separated/hidden) + '-ory' (relating to). The term describes internal secretion systems, particularly endocrine glands discovered in the 19th century.
Your pancreas is endosecretory—it quietly releases insulin directly into your blood to control sugar levels, and when this system fails, you get diabetes; it's one of the body's most critical internal communication systems that most people never think about.
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