pressor

any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure

[6] अनुकंपी स्नायु तंत्र से प्राप्त इनपुट गुर्दे में वाहिकासंकीर्णक (

The nerves have narrowed down because of the identified Pressor.