Urine passes, in the given order, through which of the following stuctures?

Question

BlackTom AI · Accepted Answer

Urine formed in the nephrons drains from collecting ducts into the renal pelvis, then passes down the ureter to the bladder and exits via the urethra.

1. Relevant knowledge points and concepts
- Nephron output: Each nephron’s collecting duct collects final urine from several distal tubules.
- Renal papilla → calyces → renal pelvis: Collecting ducts empty at the renal papilla into minor calyces (then major calyces), which converge into the renal pelvis.
- Ureter and bladder function: The renal pelvis funnels urine into the ureter; peristaltic waves move urine to the urinary bladder for storage.
- Urethra: The urethra conveys urine from the bladder to the external environment.

2. Step-by-step reasoning process
- Step 1: Final urine is in the collecting duct.
- Step 2: It exits the collecting ducts at the renal papilla into minor and major calyces, which join the renal pelvis.
- Step 3: The renal pelvis channels urine into the ureter.
- Step 4: The ureter transports urine to the urinary bladder.
- Step 5: When voiding, urine leaves the bladder through the urethra.

3. Intermediate anatomical transitions (explicit)
- Collecting duct → renal papilla → minor calyx → major calyx → renal pelvis → ureter → bladder → urethra.

4. Why the correct answer is correct
The sequence “collecting duct, renal pelvis, ureter, bladder, urethra” correctly follows the anatomical drainage route from the site of urine formation to external exit, summarizing the calyces/pelvis stage into “renal pelvis” and showing the transport (ureter) then storage (bladder) then exit (urethra).

5. Why the other options are incorrect
- Option 1 (collecting duct, renal pelvis, urethra, bladder, ureter): Puts urethra before bladder and ureter after bladder, reversing the correct pathway.
- Option 3 (renal pelvis, collecting duct, bladder, ureter, urethra): Places renal pelvis before collecting duct (wrong direction) and places ureter after bladder.
- Option 4 (collecting duct, ureter, renal pelvis, urethra, bladder): Places ureter before renal pelvis and puts urethra before bladder—both anatomically incorrect.

6. Conclusion
The correct sequence is collecting duct, renal pelvis, ureter, bladder, urethra, which matches the provided answer.

Urine passes, in the given order, through which of the following stuctures?单项选择题

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