Answer: Endorphins
Explanation:
The pituitary gland releases chemicals that are called as endorphins. These are the polypeptides which are made by the pituitary gland as well as the central nervous system. These are a kind of hormone which helps in dealing with the situations of stress and reduces the pain.
The pressure effect associated with the hormone endorphins is the part related to the increase in concentration of the dopamine production due to the activity of endorphins.
