Gastrin, secreted by the G cells in the antrum of the stomach in response to the presence of protein is the most potent stimulator of the Histamine/Acid complex. The gastrin is not only carried by the blood stream, but is also carried directly into the lumens of the gastric pits an has a direct stimulating action.
Vertebrae are the highly specialized bones which collectively make up the spinal column. The spinal column is such a distinctive anatomical feature that all animals with spinal columns are known as vertebrates, referencing the vertebrae. In humans, 33 separate bones make up the spinal column, and the structure begins to form around the third week of gestation.
The word invertebrate comes from the form of the Latin word vertebra. Vertebra means a joint in general, and sometimes specifically a joint from the spinal column of a vertebrate. In turn the jointed aspect of vertebra derived from the concept of turning, expressed in the root verto or vorto, to turn.his includes all animals apart from the subphylum Vertebrata. Familiar examples of invertebrates include insects, crabs, lobsters and their kin, snails, clams, octopuses and their kin, starfish, sea-urchins and their kin, and worms. The majority of animal species are invertebrates. One estimate puts the figure at 97%.