Before You Begin
Question #46197
The Question
During peak lactation, a mammalian female experiences a massive drain of calcium into milk, triggering a compensatory endocrine response to maintain blood calcium levels. Concurrently, an increase in her extracellular fluid volume stretches the atrial walls of her heart. Which of the following statements correctly describes the integrated physiological response at the level of the renal tubules?
Options
- A.
Parathyroid hormone (PTH) will stimulate the reabsorption of Ca²⁺, while Atrial Natriuretic Factor (ANF) will inhibit the reabsorption of Na⁺.
- B.
Thyrocalcitonin (TCT) will stimulate the excretion of Ca²⁺, while Aldosterone will stimulate the reabsorption of Na⁺.
- C.
PTH will inhibit the reabsorption of PO₄³⁻, while ANF will stimulate the release of renin from the juxtaglomerular apparatus.
- D.
Prolactin will directly increase renal Ca²⁺ reabsorption, while ANF will cause vasoconstriction of the afferent arteriole.
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
Mammalia Mammary Glands|Calcium Homeostasis|ANF Antagonism
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Integrating isolated endocrine pathways (PTH for calcium, ANF for fluid volume) acting simultaneously on the renal tubules.
The trap relies on 'Common Half-Truths' where students recognize the advanced concept of PTH's phosphaturic effect in Option C but miss the incorrect ANF-renin relationship, testing their ability to read the entire statement critically.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Mammalia Mammary Glands |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |