The tube that carries urine from the bladder to the outside of the body is the:

Question

BlackTom AI · Accepted Answer

The urethra is the final channel that conducts urine from the urinary bladder to the exterior of the body.

1. Relevant knowledge points and concepts
- Urinary system anatomy: kidneys, ureters, urinary bladder, and urethra.
- Function of each structure: kidneys filter blood and form urine; ureters transport urine from kidneys to bladder; bladder stores urine; urethra expels urine out of the body.
- Other structures listed (renal vein and collecting duct) relate to blood flow and intrarenal urine collection, not external drainage.

2. Step-by-step reasoning process
- Identify the origin and destination in the question: "from the bladder to the outside of the body" — this specifies the pathway beginning at the bladder and ending externally.
- Match each option to its anatomical role:
  - Ureter: connects kidney to bladder (transports urine to bladder), not from bladder outward.
  - Urethra: connects bladder to external environment (transports urine out).
  - Renal vein: carries filtered blood away from kidney to the systemic circulation, not involved in urine transport.
  - Collecting duct: a microscopic tubular part of the nephron inside the kidney that collects urine from nephrons and passes it to the renal pelvis, not to the body surface.

3. Intermediate logical steps (explicit)
- Step A: Does the structure start at the bladder? Only the urethra begins at the bladder.
- Step B: Does it end at the outside of the body? Only the urethra ends externally.
- Therefore, the urethra fits both start and end points required.

4. Why the correct answer is correct
- The urethra’s anatomical definition is "the canal that conveys urine from the bladder to the exterior." This exactly matches the question wording.

5. Why the other options are incorrect
- Ureter: transports urine from kidney to bladder, not from bladder outward.
- Renal vein: transports blood, not urine.
- Collecting duct: an intrarenal duct that channels urine toward the renal pelvis, not to the exterior.

6. Conclusion
The correct answer is Urethra, which matches the provided answer.

The tube that carries urine from the bladder to the outside of the body is the:单项选择题

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