Multiple choice

Which sphincters open in order to allow urination from the urinary bladder?

  1. Internal and external urethral sphincters.

  2. Urethral and renal sphincters.

  3. Renal and prostatic sphincters.

  4. Something else.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Micturition (urination) requires the relaxation of both the internal urethral sphincter (which is involuntary and made of smooth muscle) and the external urethral sphincter (which is voluntary and made of skeletal muscle).

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