Beginning with the collecting duct, place the following structures in the order urine flows to exit the body.

Collecting Duct
Major calyx
Minor calyx
Renal pelvis
Ureter
Urethra
Urinary bladder

Question

Beginning with the collecting duct, place the following structures in the order urine flows to exit the body.

Collecting Duct
Major calyx
Minor calyx
Renal pelvis
Ureter
Urethra
Urinary bladder

BlackTom AI · Accepted Answer

Collecting ducts drain the finished urine from nephrons into the renal papillae, so urine first enters the minor calyces, then major calyces, then the renal pelvis, then the ureter, is stored in the urinary bladder, and finally exits via the urethra.

Relevant concepts:
- Nephron → collecting duct: final site of tubular fluid concentration.
- Renal papilla → minor calyx → major calyx → renal pelvis: successive collecting chambers in the kidney.
- Renal pelvis → ureter → urinary bladder → urethra: outflow tract to storage and external exit.

Step-by-step reasoning with the numbering used in the question (1 = Collecting Duct, 2 = Major calyx, 3 = Minor calyx, 4 = Renal pelvis, 5 = Ureter, 6 = Urethra, 7 = Urinary bladder):
1. Start at 1 (Collecting Duct). Collecting ducts converge at the renal papilla and empty into 3 (Minor calyx). 
2. Multiple minor calyces join to form 2 (Major calyx).
3. Major calyces drain into 4 (Renal pelvis), the central collecting chamber of the kidney.
4. The renal pelvis narrows into 5 (Ureter), which conducts urine from the kidney to the pelvic cavity.
5. The ureter delivers urine into 7 (Urinary bladder), where urine is stored.
6. Storage ends when voiding occurs and urine leaves the body via 6 (Urethra).

Why the correct answer is correct:
- The anatomical continuity dictates the exact sequence: collecting duct → minor calyx → major calyx → renal pelvis → ureter → bladder → urethra. The option "1, 3, 2, 4, 5, 7, 6" maps exactly to that correct anatomical pathway.

Why the other options are incorrect (brief):
- "1, 2, 3, 5, 6, 4, 7": puts major calyx before minor calyx and misplaces the renal pelvis and bladder/urethra order — anatomically wrong.
- "1, 3, 2, 7, 4, 5, 6": inserts bladder (7) before renal pelvis (4) and ureter (5) — impossible.
- "1, 4, 3, 7, 6, 2, 5": renal pelvis before minor calyx and bladder before ureter/major calyx — incorrect sequence.
- "1, 4, 3, 2, 7, 6, 5": renal pelvis before calyces and ureter last — anatomically reversed.

Final confirmation: The correct and anatomically accurate order is 1, 3, 2, 4, 5, 7, 6, which matches the provided answer.

Beginning with the collecting duct, place the following structures in the order urine flows to exit the body. Collecting Duct Major calyx Minor calyx Renal pelvis Ureter Urethra Urinary bladder单项选择题

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