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Urinary Tract Infections Quiz
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Which of the following is the most important anatomical factor that predisposes adult women to urinary tract infections compared with men?
- A A shorter urethra that reduces the distance for ascending bacteria You picked ✓
- B A weaker urethral sphincter that allows bacteria to reflux into the bladder You picked ✕
- C A larger bladder capacity that allows urine to stagnate You picked ✕
- D A shorter ureter that allows bacteria to reach the bladder more easily You picked ✕
- E A longer urethra that gives bacteria more surface area to colonise You picked ✕
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Incorrect
The answer is A: A shorter urethra that reduces the distance for ascending bacteria
Explanation
Why A is correct
See Epidemiology and Risk Factors. Option A is correct because the female urethra is only about 4 cm long, compared with roughly 15 to 20 cm in men, so bacteria have a much shorter distance to climb to reach the bladder. The opening of the urethra, the meatus, also lies close to the vaginal opening (the introitus) and to the anus, which brings it near the bacteria that normally live in the bowel and perineum (the area between the anus and the genitals). Most urinary tract infections (UTIs) arise this way: organisms from the perineum ascend the urethra into the bladder, and in the community the commonest culprit is Escherichia coli, causing 70 to 85% of infections. About half of women will have at least one UTI in their lifetime. Men are largely protected until older age, when prostatic enlargement and incomplete emptying become important. Other factors raise a woman's risk further, including sexual intercourse, pregnancy and the menopause, but the short urethra is the key anatomical difference. A simple aid: the shorter the tube, the shorter the journey for the bacteria.
- Urethral length: About 4 cm in women, compared with roughly 15 to 20 cm in men.
- Position: The meatus lies close to the vaginal opening and the anus, near bowel bacteria.
- Route: Organisms from the perineum ascend the urethra into the bladder.
- Commonest organism: Escherichia coli, causing 70 to 85% of community infections.
Why the other options are incorrect
- B. A weaker urethral sphincter that allows bacteria to reflux into the bladder: Urethral sphincter tone affects continence rather than the ascent of bacteria, so it does not explain the female predominance. Your answer
- C. A larger bladder capacity that allows urine to stagnate: Bladder capacity is not a recognised sex difference that increases infection, and urinary stasis from incomplete emptying is more relevant in men with prostatic enlargement. Your answer
- D. A shorter ureter that allows bacteria to reach the bladder more easily: The ureter runs from the kidney to the bladder and is not the route by which perineal bacteria enter the bladder; a shorter ureter would not increase ascending bladder infections. Your answer
- E. A longer urethra that gives bacteria more surface area to colonise: The female urethra is shorter, not longer, so this option describes the opposite of the anatomical difference. Your answer
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2
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