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Question #45357
The Question
During extreme water stress, organisms exhibit various physiological adaptations, ranging from the activation of the Renin-Angiotensin-Aldosterone System (RAAS) to entering states of metabolic dormancy like aestivation. Regarding the hormonal regulation of kidney function and these adaptations, identify the INCORRECT statement:
Options
- A.
A fall in glomerular blood flow activates the juxtaglomerular (JG) cells to release renin, which converts the plasma protein angiotensinogen into angiotensin I.
- B.
Angiotensin II restores GFR by acting as a potent vasoconstrictor and by stimulating the adrenal medulla to release aldosterone, promoting Na+ and water reabsorption.
- C.
Desert-adapted mammals, such as the Kangaroo rat, can bypass the need for exogenous water intake by relying on metabolic water generated during internal fat oxidation.
- D.
The release of Atrial Natriuretic Factor (ANF) in response to increased blood flow to the atria causes vasodilation, acting as a negative feedback check on the RAAS.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Aldosterone|Angiotensin_II|Kidney|JGA|Osmoregulation
Why This Question Is Tricky
Common Mistakes
Location Trap / Functional Overlap: Students often memorize the 'Angiotensin II -> Aldosterone' sequence but fail to precisely identify the anatomical source of aldosterone (Adrenal Cortex vs.
Adrenal Medulla).
The trap exploits the common misconception of treating the adrenal gland as a single functional unit rather than distinct endocrine tissues.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Human Reproduction - Class 12 |
| Concept | Hormonal Feedback Loops |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |