Say you take magic mushrooms makes your brain happy. But it makes your tummy and intestines unhappy.

Quote Your body uses the same signals in the brain and the rest of your body because it 's more efficient (only need the genes to produce one signalling chemical and one receptor) and it doesn't normally cause problems reusing the same signals. Your brain has a barrier (the blood–brain barrier) that stops most of the chemical signals from your body getting into the brain (where they would interfere with the brains signals). Quote

What do they mean same signals? What are these signals and what are these signals used for. How do medication or in the case magic mushrooms cause these signals?

What do they mean the other parts of the human body uses these same signals why?

Why does your tummy and intestines not use other signals?

44 minutes ago, Moon99 said:

Say you take magic mushrooms makes your brain happy. But it makes your tummy and intestines unhappy.

Quote Your body uses the same signals in the brain and the rest of your body because it 's more efficient (only need the genes to produce one signalling chemical and one receptor) and it doesn't normally cause problems reusing the same signals. Your brain has a barrier (the blood–brain barrier) that stops most of the chemical signals from your body getting into the brain (where they would interfere with the brains signals). Quote

What do they mean same signals? What are these signals and what are these signals used for. How do medication or in the case magic mushrooms cause these signals?

What do they mean the other parts of the human body uses these same signals why?

Why does your tummy and intestines not use other signals?

What source are you quoting from?

Moderator Note

We keep running into this same issue. You need to cite the source of the claims you post, so that it can be checked for context and credibility

You may find answers to your questions in the Wikipedia articles 5-HT receptor and Psilocin.