Urine leaves the body through a sphincter in the process of urination, and from the bladder, urine leaves the body. Given these facts, urine has to pass through what as the bladder empties among the following options:
- epidermal
 - body water
 - a sphincter
 - all liquids
 - mouth of rivers
 - alveoli
 - salt and water.
 - aqueous solution


 

   a sphincter      