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Question #46324
The Question
During acute fluid overload, increased venous return stretches the atrial walls of the heart, triggering a specific endocrine response. How does this primary endocrine response indirectly influence the neural regulation of respiration?
Options
- A.
It secretes ANF which inhibits RAAS, reducing pulmonary capillary hydrostatic pressure and optimizing the ventilation-perfusion ratio, thereby altering feedback to the medullary rhythmicity center.
- B.
It releases ANF which directly stimulates the chemosensitive area adjacent to the rhythm center, increasing the inspiratory rate to oxygenate the excess blood volume.
- C.
It triggers the release of Renin, which causes vasoconstriction and increases pulmonary blood flow, forcing the pneumotaxic center to reduce the duration of inspiration.
- D.
It secretes ANF which acts as a potent vasoconstrictor, increasing systemic vascular resistance and causing the medullary respiratory center to initiate hyperventilation.
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
ANF_Antagonism|Plasma_Proteins_and_Osmotic_Pressure|Neural_Regulation_Feedback
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often compartmentalize human physiology, isolating the Excretory/Circulatory systems (ANF antagonizing RAAS) from the Respiratory system (Medullary regulation).
The trap lies in assuming endocrine hormones like ANF directly stimulate respiratory neural centers (Option B), rather than understanding the indirect, integrated physiological bridge where hemodynamic shifts (blood volume/pressure) alter pulmonary gas exchange dynamics, which in turn modulates medullary rhythmicity.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Breathing and Exchange of Gases - Class 11 |
| Concept | Neural Regulation Feedback |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |