Dental Student
2+ Year Member
Jun 3, 2015
Dental Student
Peptides act quicker. Steroids work on the nucleus to alter transcription/translation, which obviously takes some time to occur. This is why the effct of a steroid may take days to occur. In contast, epinephrine is needed instantaneously. It binds to a cell surface receptor and acts very fast via a cascade of 2nd messengers. If it took days to cause its desired effect you'd already be dead.
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