As the pornography played, the patients were injected with emetic drugs and administered electric shocks.

Recent studies have implicated its function as a chemoreceptor trigger site for vomiting in response to emetic drugs.

Apomorphine is a D-like and D-like receptor agonist and it is an emetic drug.

Without this barrier, emetic drugs and toxins are free to interact with a receptor (biochemistry), or multiple receptors located in the CTZ.