Question at position 6 The collecting ducts of the kidney are found in the __________.renal pyramidureterrenal sinusrenal pelvis单项选择题
A
renal pyramid
B
ureter
C
renal sinus
D
renal pelvis

Question

Question at position 6 The collecting ducts of the kidney are found in the __________.renal pyramidureterrenal sinusrenal pelvis

BlackTom AI · Accepted Answer

Collecting ducts are located in the renal pyramid because they run through the renal medulla and converge toward the renal papilla. Relevant anatomy: each kidney is divided into cortex (outer) and medulla (inner). The medulla is organized into renal pyramids—cone-shaped structures containing parallel bundles of nephron loops (loops of Henle) and collecting ducts. Nephrons produce filtrate in the cortex; the filtrate passes through the loop of Henle into the distal tubule and then enters the collecting duct system.

Step-by-step reasoning:
1. A nephron’s final segments: after the distal convoluted tubule, filtrate drains into collecting ducts. 
2. Collecting ducts descend from the corticomedullary junction into the medulla. As they travel, many collecting ducts merge into larger papillary ducts. 
3. These papillary ducts traverse the renal pyramid and open at the renal papilla into minor calyces, thereby delivering urine into the renal pelvis. 
4. Therefore, anatomically and functionally, collecting ducts are components of the renal medulla and are contained within the renal pyramids.

Why the correct answer is correct: the collecting ducts’ path and termination at the papilla place them inside each renal pyramid; the pyramid’s structure houses the parallel collecting ducts and loops of Henle that concentrate urine.

Why the other choices are incorrect:
- Ureter: a muscular tube that transports urine from the renal pelvis to the bladder; it is external to the kidney parenchyma and does not contain collecting ducts.
- Renal sinus: an internal cavity in the kidney housing the renal pelvis, calyces, vessels, and fat; it is not the tissue region where collecting ducts are embedded.
- Renal pelvis: the funnel-shaped structure that collects urine from calyces and channels it into the ureter; collecting ducts empty into calyces/pelvis but are not located within the pelvis itself.

Conclusion: the collecting ducts are found in the renal pyramid, matching the provided correct answer.

Question at position 6 The collecting ducts of the kidney are found in the __________.renal pyramidureterrenal sinusrenal pelvis单项选择题

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