The collecting duct brings urine into the _____.

Question

BlackTom AI · Accepted Answer

Urine from the collecting ducts drains directly into a minor calyx.

Relevant knowledge points and concepts:
- A nephron’s final tubular segment is the collecting duct, which receives the filtrate (now urine) from multiple distal convoluted tubules and several nephrons.
- Collecting ducts converge into papillary (ducts of Bellini) that open at the renal papilla.
- Each renal papilla drains into a minor calyx; several minor calyces join to form a major calyx, which then drains into the renal pelvis and ureter.

Step-by-step reasoning:
1. Filtration begins in the renal corpuscle (glomerulus enclosed by the glomerular or Bowman's capsule). That structure does not receive urine from collecting ducts; it is the start of filtration.
2. The filtrate passes through proximal convoluted tubule → nephron loop (loop of Henle) → distal convoluted tubule.
3. Distal convoluted tubules from many nephrons empty into collecting ducts. The collecting ducts carry the urine toward the renal papilla.
4. Collecting ducts merge into papillary ducts that open at the tip of a renal papilla; the urine flows from the papilla into a minor calyx.
5. Minor calyces collect urine from one papilla each; multiple minor calyces feed into major calyces, then the renal pelvis, then the ureter.

Why the correct answer is correct:
The collecting duct’s anatomical endpoint is at the renal papilla where urine enters a minor calyx. Therefore the immediate structure receiving urine from the collecting duct is the minor calyx.

Why the other options are incorrect:
- Glomerular (Bowman’s) capsule: the site of filtration at the nephron’s start, not a recipient of urine from collecting ducts.
- Distal convoluted tubule: upstream of the collecting duct; it drains into the collecting duct rather than receiving urine from it.
- Nephron loop (loop of Henle): an internal segment of the nephron between proximal and distal tubules, not connected downstream to collecting duct drainage.

Conclusion: The correct answer is Minor calyx, which matches the provided answer.

The collecting duct brings urine into the _____.单项选择题

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