Which part of the autonomic nervous system sends more action potentials to effectors to cause responses such as a reduction in heart rate, narrowing of the pupils and an increase in peristalsis of the gut?

The part of the autonomic nervous system that sends more action potentials to effectors to cause responses such as a reduction in heart rate, narrowing of the pupils, and an increase in peristalsis of the gut is the Parasympathetic Nervous System.

Here's a step-by-step explanation:

1. The autonomic nervous system (ANS) is a part of the peripheral nervous system that controls involuntary functions of the body, such as heart rate, digestion, respiratory rate, pupillary response, and urination.

2. The ANS is divided into two main branches: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).

3. The SNS is often referred to as the "fight or flight" system, as it prepares the body for stressful or emergency situations. It increases heart rate, dilates the pupils, and slows down digestion.

4. On the other hand, the PNS is often referred to as the "rest and digest" system. It promotes calming of the body and the conservation of energy. It slows down the heart rate, constricts the pupils, and increases digestion (peristalsis of the gut).

5. Therefore, the part of the ANS that sends more action potentials to effectors to cause responses such as a reduction in heart rate, narrowing of the pupils, and an increase in peristalsis of the gut is the Parasympathetic Nervous System.