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Hormone
A
hormone
(
Greek
:, "impetus") is any member of a class of
signaling molecules
produced by
glands
in
multicellular organisms
that are transported by the
circulatory system
to target distant organs to regulate
physiology
and
behaviour
. Hormones have diverse chemical structures, mainly of 3 classes:
eicosanoids
,
steroids
, and
amino acid
derivatives (
amines
,
peptides
, and
proteins
). The glands that secrete hormones comprise the
endocrine signaling system
. The term hormone is sometimes extended to include chemicals produced by cells that affect the same cell (
autocrine
or
intracrine signalling
) or nearby cells (
paracrine signalling
).
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