Urine leaves the body through a sphincter in the process of urination.
Urination requires relaxation of the sphincter muscle.
 the process of urination requires relaxation of muscles .
What does the process of urination require?
(a) aerobic capacity
(b) relaxation of muscles
(c) the looseness of soil
(d) sunlight
(e) air
(f) metabolic reaction
(g) blood
(h) Converting waste.