Question:
Which one of the following pairs is correct?
Which one of the following pairs is correct?
Show Hint
Internal sphincter = involuntary; External sphincter = voluntary.
Updated On: Jun 20, 2026
- Internal urethral sphincter – smooth muscles
- External urethral sphincter – smooth muscles
- Internal urethral sphincter – striped muscles
- External urethral sphincter – unstriped muscles
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The Correct Option is A
Solution and Explanation
Step 1: Understanding urinary sphincters.
The urinary bladder has two sphincters controlling urine flow.
Step 2: Internal sphincter nature.
Internal urethral sphincter is made of smooth muscle and is involuntary.
Step 3: External sphincter nature.
External urethral sphincter is skeletal (striated) and voluntary.
Step 4: Evaluating options.
Only option (1) correctly matches internal sphincter with smooth muscle.
Step 5: Physiological reasoning.
Internal control is automatic, external control is voluntary.
Step 6: Final conclusion.
Thus, internal urethral sphincter is smooth muscle.
The urinary bladder has two sphincters controlling urine flow.
Step 2: Internal sphincter nature.
Internal urethral sphincter is made of smooth muscle and is involuntary.
Step 3: External sphincter nature.
External urethral sphincter is skeletal (striated) and voluntary.
Step 4: Evaluating options.
Only option (1) correctly matches internal sphincter with smooth muscle.
Step 5: Physiological reasoning.
Internal control is automatic, external control is voluntary.
Step 6: Final conclusion.
Thus, internal urethral sphincter is smooth muscle.
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