One out of every few thousand babies is born with pathological constriction or blockage of the aorta at a point beyond the aortic arterial branches to the head and arms but proximal to the renal arteries, a condition called coarctation of the aorta. This condition can be mimicked in animal model. When this occurs, the arterial pressure in the upper part of the body may be higher than that in the lower body. However, in a few days the arterial pressure in the lower body can reach near basal levels. Choose the answer that best explains the mechanism involved in pressure regulation in this model: