Question

_____________ muscles line urethral opening:

• A. smooth
• B. cardiac
• C. involuntary
• D. both a and c

Answer 1

The correct option is D

both a and c

The external urethral orifice (urinary meatus) is the external opening of the urethra, from which urine is ejected during urination. Urethral opening is made of smooth muscle, therefore it is under involuntary or autonomic control. The urethral sphincters are two muscles used to control the exit of urine in the urinary bladder through the urethra. The internal sphincter is a continuation of the detrusor muscle and is made of smooth muscle, therefore it is under involuntary or autonomic control. The autonomic nervous system (ANS) is a division of the peripheral nervous system that supplies smooth muscle and glands, and thus influences the function of internal organs.