While a plant-based meal would qualify as vegan (adjective), a person who follows a plant-based (vegan) diet is not necessarily a vegan (noun). For example, someone could follow a plant-based diet but still wear leather and have no moral issue with hunting or killing animals for food.
Ball-and-stick model of cimetidine, the prototypical H 2 -receptor antagonist. The H2 receptor antagonists are a class of drugs used to block the action of histamine on parietal cells (specifically the histamine H2 receptors) in the stomach, decreasing the production of acid by these cells.he H 2 antagonists are competitive antagonists of histamine at the parietal cell H 2 receptor. They suppress the normal secretion of acid by parietal cells and the meal-stimulated secretion of acid.
A receptor antagonist is a drug that binds to a receptor but does not send any signal. A receptor antagonist can block other ligands from binding. In this way, an antagonist can block the effects of agonists, whether those agonists are drugs or neurotransmitters.Some alcohol antagonists are receptor antagonists, but many are not. Do not be confused. receptor antagonist can block other ligands from binding. In this way, an antagonist can block the effects of agonists, whether those agonists are drugs or neurotransmitters. Some alcohol antagonists are receptor antagonists, but many are not. Do not be confused.