In a sheep kidney dissection, the funnel-shaped cavity that collects urine is the:

Question

BlackTom AI · Accepted Answer

The funnel-shaped cavity that collects urine in the kidney is the renal pelvis because it is the central collecting chamber that receives urine from the calyces and channels it into the ureter.

Relevant knowledge points and concepts:
- Kidney organization: outer renal capsule (fibrous covering), cortex (outer tissue layer with glomeruli), medulla (inner tissue containing pyramids), minor and major calyces (small and larger cups that collect urine from papillary ducts), and renal pelvis (the large central funnel-shaped chamber).
- Flow of urine: nephron → collecting ducts → renal papillae → minor calyx → major calyx → renal pelvis → ureter.

Step-by-step reasoning:
1. Identify the role of a “funnel-shaped cavity that collects urine”: this describes a central collecting structure that receives urine from multiple channels and empties into the ureter.
2. Examine each option:
   - Renal capsule: a fibrous outer covering; does not collect urine.
   - Renal pelvis: anatomically described as a funnel-shaped dilated proximal part of the ureter; collects urine from major calyces.
   - Minor calyx: small cup-like structures that receive urine from individual papillae, but not the single large funnel.
   - Cortex: outer kidney region containing nephrons; not a collecting funnel.
3. Trace urine pathway: urine from renal papillae enters minor calyces → several minor calyces converge into major calyces → major calyces merge into the renal pelvis, the funnel-shaped chamber that leads to the ureter.

Why the correct answer is correct:
- The renal pelvis is explicitly described in anatomy as the funnel-shaped cavity that collects urine from the calyces and channels it into the ureter; this matches the question wording exactly.

Why other options are incorrect:
- Renal capsule is a covering, not a collecting cavity.
- Minor calyx is a small cup, not the single funnel-shaped cavity.
- Cortex is renal tissue, not a urine-collecting chamber.

Conclusion: The correct answer is Renal pelvis, which matches the provided answer.

In a sheep kidney dissection, the funnel-shaped cavity that collects urine is the:单项选择题

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