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.
The brainstem actually has three main components — and I know this is getting to be a lot of vocabulary here — you have the midbrain, the pons, and the medulla oblongata.
And from a very tiny, underused part of my brain — probably located at the base of my medulla oblongata where my subconscious dwells — comes the thought: he's here to see you.