Post navigation Next ArticlePrevious Article Serotonin ·5 June 2017 A neurotransmitter that is involved in pain suppression and vasoconstriction. Tweet Share Pin it Comment Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Name * Email * Website Comment By using this form you agree with the storage and handling of your data by this website. * Notify me of new posts by email. This site uses Akismet to reduce spam. Learn how your comment data is processed.