There are peripheral baro-receptors stimulated by arterial stretch, are located within the aortic arch and carotid sinus.
Aortic arch receptors: are innervated by the vagus nerve.
Carotid sinus receptors: are innervated by the glossopharyngeal.
The main role of the RAAS system is to maintain blood pressure, and it functions to do this in two ways.
Let’s follow the system through and assume there is a drop in blood pressure.