Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 23 of 99
The involuntary internal sphincter muscle that controls urine release is located at the anatomical junction between the:
A
Renal pelvis and ureter
B
Ureter and urinary bladder
C
Urinary bladder and urethra
D
Urethra and ureter
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Urinary bladder and urethra
Concept: Urinary bladder sphincters.

Solution: The internal urethral sphincter consists of smooth muscle located at the junction of the urinary bladder and the urethra, preventing urine flow under autonomic nervous control.

Why other options are incorrect:
  • Option A & Option B: Ureters connect the renal pelvis to the bladder; muscle folds act as passive valves here, not true sphincters.

  • Option D: Urethra and ureter do not directly join each other.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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