Urethra : It is a ......... struc-ture arising from urinary blad-der and opening to the exterior of the body. There urethral sphincters between urinary 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.
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urethra : tube-like
sphincter : smooth muscles
external sphincter : strait muscles
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