Final answer:
The parasympathetic division of the ANS is called the "rest-and-digest" system because C) it slows down bodily functions, aiding relaxation and digestion, which conserves energy for the body.
Step-by-step explanation:
The parasympathetic division of the autonomic nervous system (ANS) is considered the "rest-and-digest" division because its primary role is to conserve and restore the body's energy during peaceful, restful periods. This division brings about a state that supports functions such as digestion and energy conservation. The correct answer to why the parasympathetic division is known as the "rest-and-digest" system is It slows down bodily functions, promoting relaxation and digestion. When activated, the parasympathetic division decreases heart rate, narrows air passages in the lungs, lowers blood pressure, and stimulates the digestive system, which contrasts with the sympathetic division that prepares the body for fight or flight by doing the opposite - increasing heart rate, widening air passages, increasing blood flow to skeletal muscles, and shutting down digestive activities temporarily.