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Question #46702
The Question
In a frog (Rana tigrina), severe venous congestion leads to the stretching of the atrial walls, triggering the release of Atrial Natriuretic Factor (ANF). Considering the integrated physiology of amphibians, which of the following statements correctly explains the consequence of this endocrine response on its respiratory hemodynamics?
Options
- A.
ANF stimulates the Renin-Angiotensin-Aldosterone System (RAAS), increasing cutaneous blood flow to maximize integumentary respiration.
- B.
ANF alters the vascular resistance of the cutaneous capillary bed to prioritize core organ perfusion, proving that cutaneous respiration is dependent on systemic cardiovascular control.
- C.
ANF induces severe bronchoconstriction in the lungs, forcing the frog to rely entirely on passive, unregulated cutaneous diffusion.
- D.
ANF directly increases the affinity of amphibian hemoglobin for oxygen, bypassing the need for altered cutaneous or pulmonary blood flow.
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
Frog Integumentary Respiration|Atrial Natriuretic Factor (ANF)|Partial Pressure Gradient Logic
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often compartmentalize physiological systems, viewing amphibian cutaneous respiration as a purely passive, independent physical process.
The trap lies in failing to integrate NCERT concepts from 'Chemical Coordination' (ANF release due to atrial stretch) with 'Breathing and Exchange of Gases' (cutaneous vascularization).
The question tests the advanced understanding that peripheral respiratory surfaces are dynamically regulated by central cardiovascular endocrine responses.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Structural Organisation in Animals - Class 11 |
| Concept | Frog Integumentary Respiration |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |