Urinary Tract Infections Quiz

See Epidemiology and Risk Factors. The shorter female urethra, A, reduces the distance bacteria must travel to reach the bladder. The external opening is also close to the anus and vaginal opening, where organisms can reach the surrounding skin. Common urinary pathogens such as Escherichia coli originate in the gut and can colonise this region before ascending the urethra. This route explains why bladder infection is more frequent in women without requiring an underlying anatomical abnormality. The urethra is the outlet from the bladder, whereas the ureter connects a kidney to the bladder; confusing these similarly named structures obscures the mechanism. Individual risks such as instrumentation or obstruction still matter, but do not explain this normal anatomical difference.

Catheter use (E) is an acquired exposure that bypasses normal defences, rather than an intrinsic female anatomical feature. Stones (D) can obstruct drainage or harbour bacteria but are not the basic reason for the sex difference. Bladder capacity (C) is not the decisive feature: incomplete emptying matters more than simply being able to hold more urine. Healthy women do not normally have higher urinary glucose (B); glucose in urine can occur with hyperglycaemia or altered renal glucose reabsorption.