Which of the following is not true of the urinary bladder?
A. Rugae are folds of the mucosa that allow the urinary bladder to stretch for urine storage.
B. The trigone contains openings for the ureters and the urethra.
C. The detrusor muscle makes up the muscular coat of the urinary bladder.
D. The bladder can store about 600 mL of urine, but the urge to void can be felt when it contains about 500 mL.
E. All of these are true of the urinary bladder.
Answer: D
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