Rayna has discovered a new substance that she thinks is a neurochemical. the substance is secreted by special neurons into the blood supply and travels to the digestive system where there are specialized receptors for it. most likely, what is the substance that rayna has discovered?

The substance that Rayna has discovered is most probably a neurohormone.

Explanation:

The special regulatory substance that is produced by the brain in response to a specific sensation or an internal process happening within the body is referred to as a neurohormone. Such hormones travel to various parts of our body through the medium of blood and initiate internal actions that bring substantial temporary changes in the functioning of the organs. The secretion of hormones mostly happens as a result of an external stimulus.

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