[Expert Solution]: There are four pathways that go to the…

There are four pathways that go to the vomiting centre in the medulla, and you have four friends who are vomiting from different causes. Another friend who is there to help has brought his first aid kit with three drugs, a benzodiazepine called Xanax, a first-generation antihistamine called diphenhydramine, and a 5H3 Selective serotonin antagonist named ondansetron. Choose the friend below who is about to receive the wrong treatment. a. Friend 1 has vomiting that results from extreme pain or the psychological stress of seeing something very disturbing. and is most likely to benefit from the benzodiazepine. b. Friend 2 is going on a boat and is very susceptible to motion sickness and is about to receive the first-generation antihistamine called diphenhydramine c. Friend 3 ate some stale shellfish with bacterial toxins and although ondansetron would probably stop the nausea and vomiting, it is decided that they receive no medication so that the toxins are naturally expelled from the body. It is decided that he should get fluids and electrolytes and be monitored closely.