Endocrine is when a substance (hormone) is released by one cell in one part of the body and acts somewhere else. This is different to autocrine, where the hormone acts on the same cell group it was released from and paracrine which is when hormones act locally. There are different types of hormone: peptide hormones (insulin) and lipid hormones (testosterone) are two types.
They do all sorts: control blood sugar, mood, hunger, metabolism, organ function, growth and inflammation.
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