Think about your answer, then reveal below.
Model answer: Deep, slow breathing activates the parasympathetic nervous system, which is the 'rest and digest' counterpart to the fight-or-flight response. Specifically, slow exhalation stimulates the vagus nerve, which signals the heart to slow down, lowers blood pressure, and reduces stress hormone levels. This directly reverses the physical symptoms of the stress response.
This connects the nervous system topic to practical application. The autonomic nervous system has two branches: sympathetic (fight-or-flight, activated by stress) and parasympathetic (rest-and-digest, activated by relaxation). Deep breathing is one of the few voluntary actions that can shift the balance from sympathetic to parasympathetic activation, making it a powerful, portable, and free stress management tool.