Molecular
Agonist versus antagonist at the synapse

Description
An illustration by BruceBlaus contrasting how agonist and antagonist drugs act at receptors in a synapse. It is a useful teaching visual for basic receptor pharmacology.
This illustration was created by BruceBlaus and is not Sterling IMRES work. It is shown under CC BY-SA 4.0. Reuse it only on the terms of that licence and credit the creator.
More illustrations

Anatomy
Heart and lungs, front view (Gray's Anatomy, plate 490)
Henry Vandyke Carter (Gray's Anatomy of the Human Body, 1918)Public domain
