Final answer:
The parasympathetic division of the autonomic nervous system manages 'rest and digest' functions and the sympathetic division governs 'fight or flight' responses.
Step-by-step explanation:
The functions listed such as 'rest and digest,' conservation of energy, lowering heart rate, decreasing blood pressure, and stimulating digestion, are all responsibilities of the parasympathetic division of the autonomic nervous system (ANS). Conversely, the 'fight or flight' response and responding to stress and emergencies are governed by the sympathetic division. These two divisions work in a complementary fashion to maintain the body's internal balance, known as homeostasis.
The parasympathetic division is responsible for 'rest and digest' activities; the sympathetic division handles 'fight or flight' responses.