Ranitidine is a competitive, reversible inhibitor of the action of histamine at the histamine H2-receptors, including receptors on the gastric cells. Ranitidine does not lower serum Ca++ in hypercalcemic states. Ranitidine is not an anticholinergic agent.
1 The Blue Marlins have a diet of: Octopi, squid and pelagic fish such as black fin tuna and frigate mackerel.  They do prefer to hunt alone and during the day, rather than in schools, so it is safe to say they are a rather antisocial species.
What do blue whales eat? The blue whale is the biggest animal in the world, but strangely, it survives by eating very small creatures! These tiny animals are called krill, which look like very small shrimp and are around 1-2cm long. An adult whale can eat up to 40 million krill a day or around 8,000 lbs. Blue whales can only eat small prey because they have a very narrow oesophagus (throat). Watch a video of a blue whale below: