There are over 60 types in the human body, some microscopically small, in particular the millions of precapillary sphincters. Sphincters relax at death, often releasing fluids and feces. Was your guess near the answer? --- https://imgur.com/qL0DHFI https://imgur.com/JL9rRLt https://youtu.be/dQw4w9WgXcQ