The histamine receptor H2 belongs to the rhodopsin-like family of G protein-coupled receptors. It is an integral membrane protein and stimulates gastric acid secretion. It also regulates gastrointestinal motility and intestinal secretion and is thought to be involved in regulating cell growth and differentiation.
The H2 here is involved in only gastric acid secretion. What ever you quoted will not happen at the gastric tract. For every molecule there are a plethora of actions. It all depends on a particular tissue. You cannot generalise the actions - need to be specific at that particular tissue / organ
