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Additional
steroid
English Wikipedia - The Free Encyclopedia
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Steroid
A
steroid
is an
organic compound
with four rings arranged in a specific
configuration
. Examples include the dietary
lipid
cholesterol
, the sex hormones
estradiol
and
testosterone
and the
anti-inflammatory
drug
dexamethasone
. Steroids have two principal biological functions: certain steroids (such as cholesterol) are important components of
cell membranes
which alter
membrane fluidity
, and many steroids are
signaling molecules
which activate
steroid hormone receptors
.
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