Question

Urethra : It is a ......... struc-
ture arising from urinary blad-
der and opening to the exterior
of the body. There are
urethral sphincters between uri-
nary bladder and urethra.
a. Internal sphincter : Made up
of ............ muscles, involuntary
in nature.
b. External sphincter : Made up
of ............. muscles, voluntary
in nature.
If this valve is not functioning
properly during inflammation
of bladder, it can lead to kidney
infection.​

Answer 1

Answer:

involuntary muscles......