sphincter
A ring-shaped muscle that surrounds a natural opening in the body and can open or close it by relaxing or contracting.
Last Updated
October 7, 2025
October 7, 2025
Last updated: October 7, 2025.
This article was contributed by .
Explore More
Self Harm — Cutting
It’s difficult to watch your child experience emotional pain. It’s even more difficult to see physical signs of their pain. Cutting is the act of purposely cutting yourself with a sharp object, suc...