Question at position 4 Which of the following is the pathway of urine as it is produced and leaves the kidney?Renal pelvis, nephron, ureter, minor calyx, collecting ductMajor calyx, nephron, collecting duct, papilla, ureterPapilla, collecting duct, major calyx, nephron, ureterNephron, collecting duct, papilla, minor calyx, major calyxCollecting duct, minor calyx, nephron, papilla, renal pelvis

Question

Question at position 4 Which of the following is the pathway of urine as it is produced and leaves the kidney?Renal pelvis, nephron, ureter, minor calyx, collecting ductMajor calyx, nephron, collecting duct, papilla, ureterPapilla, collecting duct, major calyx, nephron, ureterNephron, collecting duct, papilla, minor calyx, major calyxCollecting duct, minor calyx, nephron, papilla, renal pelvis

BlackTom AI · Accepted Answer

Question restatement: Which of the following is the pathway of urine as it is produced and leaves the kidney?
Options:
1) Renal pelvis, nephron, ureter, minor calyx, collecting duct
2) Major calyx, nephron, collecting duct, papilla, ureter
3) Papilla, collecting duct, major calyx, nephron, ureter
4) Nephron, collecting duct, papilla, minor calyx, major calyx
5) Collecting duct, minor calyx, nephron, papilla, renal pelvis

Option 1 analysis: Renal pelvis is downstream, not the starting point in the path of urine formation. Putting nephron after pelvis disrupts the known flow, since urine is formed inside nephrons before moving toward the renal pelvis.

Option 2 analysis: This sequence places major calyx before the nephron and includes a misordered progression (nephron should come before calyces and collecting duct before papilla). It also loops incorrectly into the ureter early, which does not reflect the actual kidney-to-ureter pathway.

Option 3 analysis: Starting with papilla and placing collecting duct afterward contradicts the known route (urine exits the papilla after passing through the collecting ducts). This reverses critical steps and misorders the flow from nephron to calyces.

Option 4 analysis: This option presents a coherent, stepwise progression that matches anatomy and physiology: urine is produced in the nephron, moves into the collecting duct, drains out of the papilla into the minor calyx, then into the major calyx. Each step leads to the next in a physiologically plausible sequence within the kidney.

Option 5 analysis: This sequence starts with collecting duct and then goes to minor calyx, but then reorders to nephron and papilla, which is inconsistent with the established path. The urine cannot jump back to earlier structures after entering the collecting system, so this ordering is incorrect.

Summary of reasoning: Among the options, the one that mirrors the canonical renal pathway is the flow from nephron → collecting duct → papilla → minor calyx → major calyx. The other options misplace or reverse key steps in the intrarenal drainage system, violating the established anatomical order from site of formation to the main renal drainage structures.

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