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.
Invertebrates are the animals that do not have a backbone or the vertebral column.Animals without the notochord are invertebrates. Most of the animals are invertebrates. The term invertebrates is a prefixed form of a Latin derived word ' Vertebra' .' Vertebra' means joint in general, specifically it means ' the joint of the spinal column of the vertebrate' . It id coupled with the prefix in meaning not or without, which conveys the meaning ' those that lack veterbrae' .ost of the animals are invertebrates. The term invertebrates is a prefixed form of a Latin derived word ' Vertebra' . ' Vertebra' means joint in general, specifically it means ' the joint of the spinal column of the vertebrate' .