You are presented with the question "What controls the urination process?" and the following answer choices: 
- microorganisms
 - mechanical waves
 - that material's properties
 - the looseness of soil
 - Muscles around the urethra
 - Bones around the urethra
 - The brain
 - Muscles around the anus

Now knowing that urine leaves the body through a sphincter in the process of urination and muscles around the urethra, called sphincter muscles, control the flow of urine out of the body, choose the best answer.


 

     Muscles around the urethra    