The herein schematic diagrams the negative feedback system that is activated by hemorrhage. All of these effects (mentioned below) lead to controlled blood pressure.
In this diagram, hemorrhage leads to decreased blood pressure, which in turn leads to increased reabsorption of fluid, increased constriction of blood vessels, increased renal conservation of fluid, and increased catecholamines and vasopressin.
Because all of the consequences tend to decrease the effect of the hemorrhage in lowering blood pressure, that is why it is being called a negative feedback system of the hemorrhage.
