Agonist & Antagonist Actions

drug. is a substance that affects some aspect of physiology when it is given to the body. ... agonists. or . antagonists. of the . cholinergic. or . adrenergic. pathways. In the Virtual Experiment, the drugs are dropped onto the frog heart and the changes in heart rate and amplitude (size) of contraction (thus force) are measured on the myogram ... ................
................