What is produced by enteric nerves for muscle contraction something.. A) Nitric oxide B) Histamine C) Norepinephrine D) Substance P

The enteric nervous system, which is a part of the autonomic nervous system and is found in the gastrointestinal tract, produces several neurotransmitters for various functions including muscle contraction.

A) Nitric oxide: This is a neurotransmitter that is produced by the enteric nerves. It is involved in the relaxation of smooth muscle, which is a type of muscle found in the gut.

B) Histamine: This is not produced by the enteric nerves. It is a compound that is involved in local immune responses and also acts as a neurotransmitter.

C) Norepinephrine: This is a neurotransmitter that is produced by the sympathetic nervous system, not the enteric nervous system. It is involved in the fight or flight response.

D) Substance P: This is a neuropeptide that is produced by the enteric nerves. It is involved in pain perception and also plays a role in the contraction of smooth muscle in the gut.

So, the enteric nerves produce both Nitric oxide and Substance P for muscle contraction and relaxation in the gut.