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Which of the following is INCORRECTLY matched related to the excretory system of humans?
Urethra – a pair
Urinary bladder – unpaired
Ureter – a pair
Kidney – a pair
Urethra – a pair
In the human excretory system, the organs occur in specific numbers: the kidneys, ureters, and adrenal glands are paired structures (present on both the left and right sides), whereas the urinary bladder and urethra are unpaired, single midline structures.
In the human excretory system, the organs occur in specific numbers: the kidneys, ureters, and adrenal glands are paired structures (present on both the left and right sides), whereas the urinary bladder and urethra are unpaired, single midline structures.
Think of the kidneys and ureters as two separate pipes feeding into a single central reservoir (the bladder) which drains out of a single main exit (the urethra).
K-U-U-B-U: Kidneys (Pair), Ureters (Pair), Urinary bladder (Unpaired), Urethra (Unpaired).
1 pair of kidneys+1 pair of ureters+1 bladder+1 urethra=Excretory system
The human excretory system functions to remove metabolic wastes. Blood is filtered in the paired kidneys, and urine travels through the paired ureters to the single, unpaired urinary bladder for temporary storage. Finally, the collected urine is excreted from the body through the single, unpaired urethra.
Kidneys are bean-shaped organs, one on each side of the vertebral column.
The urinary bladder is a muscular sac that acts as a reservoir for urine.
The urethra is a single tube connecting the bladder to the exterior.
Ureters are the paired ducts that transport urine from the kidneys to the bladder.
Renal physiology study
Clinical diagnosis of urological disorders
| Feature | Kidney/Ureter | Bladder/Urethra |
|---|---|---|
Organ | Paired (Left & Right) | Unpaired (Single) |
The urethra in males is longer than in females as it also transports semen.
Option B (Urinary bladder) is correctly matched as unpaired.
Option C (Ureter) is correctly matched as paired.
Option D (Kidney) is correctly matched as paired.
A is correct — The urethra is an unpaired, single anatomical structure in the human body, not a pair.
When answering anatomy MCQs, always distinguish between organs that are bilateral (paired) versus those that are midline (unpaired) to avoid simple categorization errors.
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