What part of the nervous system that regulates heart beat digestion?

The part of the nervous system that regulates heart beat and digestion is the autonomic nervous system (ANS).

The ANS is the part of the nervous system that controls involuntary functions, such as heart rate, digestion, breathing, and blood pressure. It is divided into two parts: the sympathetic nervous system and the parasympathetic nervous system.

The sympathetic nervous system is responsible for the fight-or-flight response. It activates the body's organs and systems to prepare for physical activity, such as increasing the heart rate, dilating the pupils, and relaxing the bladder.

The parasympathetic nervous system is responsible for the rest-and-digest response. It helps the body to relax and conserve energy, such as by slowing the heart rate, constricting the pupils, and stimulating digestion.

The autonomic nervous system works together to maintain homeostasis, or the body's internal balance. It regulates a wide range of functions, from the heart rate to the digestive system, to ensure that the body is functioning properly.