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Question #47466
The Question
Consider the physiological regulation of systemic blood pressure by catecholamines and the Renin-Angiotensin-Aldosterone System (RAAS). Which of the following statements is INCORRECT regarding their mechanisms of action?
Options
- A.
Catecholamines exhibit a short half-life, facilitating rapid, transient physiological spikes, whereas RAAS operates via a multi-organ cascade for sustained systemic regulation.
- B.
Renin, secreted by the juxtaglomerular (JG) cells, acts as a potent circulating hormone that directly binds to endothelial receptors to induce systemic vasoconstriction.
- C.
Angiotensin II stimulates the adrenal cortex to secrete aldosterone, which acts on the distal parts of the tubule to increase Na+ and water reabsorption.
- D.
A mutation causing a loss of specificity in Angiotensin II receptors on the adrenal cortex would disrupt blood volume homeostasis, potentially leading to hypovolemia.
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
Hypothalamus|Adrenal_Cortex|Angiotensin_II
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students frequently confuse the functional roles within the RAAS cascade, specifically misidentifying Renin as a direct-acting vasoconstrictor hormone rather than an enzyme that merely initiates the cascade.
This is a classic 'Functional Overlap' trap that exploits a superficial reading of NCERT's Excretory System chapter.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Neural Control and Coordination - Class 11 |
| Concept | Ipsilateral vs Contralateral Signaling |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |