Go back to Item XI before trying to answer Item XIX again. Item IIa Wrong . Physiological antagonism is caused by agonist and antagonist acting at two independent sites and inducing independent, but opposite, effects. Atropine acts at the same site as acetylcholine. Item XVIc Right .
Phenelzine inhibits monamine oxidase, the enzyme which metabolizes many biogenic amines.
Some kinds of heavy cheese have a high content of substances, mainly tyramine, which can produce an increase in blood pressure. Normally, after ingestion of such cheese, these substances are broken down rapidly by monamine oxidase. In a patient treated with phenelzine, metabolism of these amines is inhibited, and, therefore, they can produce a dangerous rise of blood pressure accompanied by a reflex bradycardia. There is, however, another drug or drug combination which would induce similar changes. Go back to Item XVI and try to find it.