The sympathetic neurons releases norepinephrine, also called noradrenaline, and the cells of the adrenal medulla release norepinephrine and epinephrine, also called adrenaline.
That sensory input gets relayed to the hypothalamus, which stimulates the medulla oblongata, which then taps the parasympathetic fibers in the vagus nerve.
The medulla oblongata serves as the integration center for ventilation and sends neural signals to the respiratory muscles, thus increasing ventilation.
These baroreceptors transmit their data to the central nervous system, and more specifically, to the cardio regulatory center of the medulla oblongata.
In the lumbar region, neural crest cells differentiate into the cells of the adrenal medulla, the inner part of the adrenal gland that sits atop the kidneys.