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.
Famotidine and ranitidine are part of a group of drugs called histamine H 2 -receptor antagonists. The other two main members, as of 2011, are cimetidine and nizatidine.All of these drugs specifically act on a molecule called a H 2 -receptor, which sticks out from the outside of some cells.amotidine and ranitidine are part of a group of drugs called histamine H 2 -receptor antagonists. The other two main members, as of 2011, are cimetidine and nizatidine.