Because it needs to dialate (expand) during labor.
The cervix connects the uterus to the vagina. The cervix is approximately two to three centimeters long, and is made up of strong muscles, and is shaped like a small donut.
cervix
I think muscles are made up of joints but i don't know.
Cardiac muscles
The only muscle of the leg that is made up of three muscles are the hamstrings.
Almost entirely.
cardiac muscles
The muscular system is made up of the muscles that enable movement. It consists of more than 600 muscles, including skeletal muscles, smooth muscles, and cardiac muscles. These muscles work together to allow voluntary and involuntary movements in the body.
The body is made up of three types of muscles: Smooth, Cardiac and Skeletal.
The muscular system is made up of muscles, the Skeletal system is made up of bones
The stomach is made of smooth involuntary muscles.
The urogenital triangle is made up of the Sphincter urethrae and the deep transverse perineal muscles.