Final answer:
The nervous system, specifically the autonomic nervous system, can slow down heart rate and digestion.
Step-by-step explanation:
Heart rate and digestion can be slowed down by the nervous system. The autonomic nervous system is responsible for regulating these processes.
When the body is in a state of rest and digest, the parasympathetic division of the autonomic nervous system is active. It slows down the heart rate and stimulates digestion, allowing the body to properly process food.
On the other hand, the sympathetic division of the autonomic nervous system is responsible for the fight-or-flight response. It accelerates the heart rate and inhibits digestion, preparing the body for physical activity in response to a perceived threat.