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Question #46387
The Question
A patient with a neurohypophyseal lesion exhibits massive diuresis, leading to a significant drop in blood volume and systemic hypotension. Urinalysis reveals no glycosuria. Regarding the physiological consequences and compensatory mechanisms in this patient, which of the following statements is INCORRECT?
Options
- A.
Aortic and carotid baroreceptors detect the systemic hypotension and send signals that would normally trigger the release of ADH from the posterior pituitary.
- B.
A fall in glomerular blood flow activates the juxtaglomerular (JG) cells to release renin, initiating a cascade to restore blood pressure.
- C.
The counter-current multiplier ceases to function, causing the medullary interstitium to lose its hyperosmolarity, which directly results in the excretion of hypotonic urine.
- D.
The tubular fluid passing through the collecting duct fails to osmotically equilibrate with the hypertonic medullary interstitium due to the absence of ADH-dependent water channels.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Loop_of_Henle|Vasopressin|Collecting_Duct
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often conflate the 'creation' of the medullary osmotic gradient (Counter-Current Multiplier, which is ADH-independent) with the 'utilization' of that gradient (Collecting Duct permeability, which is ADH-dependent).
The trap assumes that the production of dilute urine implies a failure of the Loop of Henle's multiplier system, whereas it is actually a failure of distal facultative reabsorption.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Body Fluids and Circulation - Class 11 |
| Concept | Hypertension vs Hypotension Logic |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |