When feeling overwhelmed or stressed, practicing 'diaphragmatic breathing' or 'belly breathing' primarily helps to activate which part of the nervous system, promoting relaxation?

Explanation

Diaphragmatic breathing stimulates the vagus nerve, which is a key component of the parasympathetic nervous system. This system is responsible for the 'rest and digest' response, counteracting the 'fight or flight' response of the sympathetic nervous system and promoting relaxation.