Q.186 Zoology ⭐ 360° Option Elimination Active

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NEET 2024 Zoology Question 186 Solution

Topic: Excretory Products and their Elimination · Official NTA Booklet Code T1

Question

Choose the correct statement given below regarding juxta medullary nephron.

(1)Loop of Henle of juxta medullary nephron runs deep into medulla.
(2)Juxta medullary nephrons outnumber the cortical nephrons.
(3)Juxta medullary nephrons are located in the columns of Bertini.
(4)Renal corpuscle of juxta medullary nephron lies in the outer portion of the renal medulla.

✓

Verified Against NTA Final Answer Key

Option (1) : Loop of Henle of juxta medullary nephron runs deep into medulla.

📚 Excretory Products and their Elimination Easy

📋 Given Parameters & Problem Setup

Nephron Type Juxtamedullary nephron

Evaluation Identify the correct factual statement

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The 30-Second Exam Hall Shortcut: ⚡ Juxtamedullary Nephron Hallmark

⏱️ Save ~20 seconds

Juxtamedullary nephrons constitute ~15% of nephrons, have glomeruli near the corticomedullary border, and possess extremely LONG loops of Henle running deep into the inner medulla!

1 Recall comparative nephron anatomy:

2 - Cortical nephrons (85%): Short Henle's loop extending only very little into medulla; vasa recta reduced/absent.

3 - Juxtamedullary nephrons (15%): Renal corpuscle near inner cortex, very LONG Henle's loop running DEEP into the medulla, well-developed vasa recta essential for hyperosmotic countercurrent gradient.

4 Statement (1) states: "Loop of Henle of juxta medullary nephron runs deep into medulla" -> 100% TRUE.

5 Select Option (1) / A.

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Excretory Products and their Elimination (Cortical vs Juxtamedullary Nephrons)

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Compare Cortical vs Juxtamedullary Nephrons

In majority of nephrons (cortical nephrons), the loop of Henle is too short and extends only very little into the medulla. In some of the nephrons, the loop of Henle is very long and runs deep into the medulla. These nephrons are called juxtamedullary nephrons.

Step 2

Evaluate Location of Renal Corpuscle

The Malpighian corpuscle, PCT and DCT of all nephrons are situated in the cortical region of the kidney. In juxtamedullary nephrons, the corpuscle lies in the deeper cortex close to the medulla (corticomedullary junction), but never inside the renal medulla itself.

Step 3

Verify Proportion in Kidney

Cortical nephrons constitute about 80-85% of total nephrons, whereas juxtamedullary nephrons constitute only 15-20%. Therefore, they do not outnumber cortical nephrons.

⭐

360° Option Elimination Engine Key Feature

Diagnose every choice: Know exactly why the right option works and why distractors fail.

4-Option Deep Scan

1 (1)

✓ 100% Correct

Verdict & Scientific Reason:

NCERT verbatim fact: Juxtamedullary nephrons have exceptionally long loops of Henle that run deep into the renal medulla.

💡

Why this is airtight: None.

2 (2)

✗ Incorrect

Verdict & Scientific Reason:

Cortical nephrons comprise ~85% of total nephrons, strongly outnumbering juxtamedullary nephrons (~15%).

⚠️

Student Fallacy (Why candidates pick this trap): Cortical nephrons comprise ~85% of total nephrons, strongly outnumbering juxtamedullary nephrons (~15%).

3 (3)

✗ Incorrect

Verdict & Scientific Reason:

Columns of Bertini are cortical extensions between medullary pyramids, not the specific anatomical home of juxtamedullary nephrons.

⚠️

Student Fallacy (Why candidates pick this trap): Columns of Bertini are cortical extensions between medullary pyramids, not the specific anatomical home of juxtamedullary nephrons.

4 (4)

✗ Incorrect

Verdict & Scientific Reason:

All renal corpuscles are strictly located in the renal cortex.

⚠️

Student Fallacy (Why candidates pick this trap): All renal corpuscles are strictly located in the renal cortex.

⚠️

NTA Trap Alert: Corpuscle in Medulla Misconception

Assuming "juxtamedullary" means the renal corpuscle is in the medulla.

🛡️ How to avoid the -1 mark: All glomeruli/corpuscles are exclusively in the cortex; "juxta" means next to the medulla.

📖

Core NEET Syllabus Standard

Biology Core Zoology · Excretory Products and their Elimination Standard Benchmark

Core Scientific Principle Tested:

"In majority of nephrons, the loop of Henle is too short and extends only very little into the medulla (cortical nephrons). In some of the nephrons, the loop of Henle is very long and runs deep into the medulla. These nephrons are called juxta medullary nephrons."

Syllabus Focus: Juxtamedullary Nephrons: Structural Hallmarks and Medullary Penetration

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2024 Zoology Question 186 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Juxtamedullary Nephron Hallmark

Step-by-Step Rigorous Workflow & Mathematical Proof

Compare Cortical vs Juxtamedullary Nephrons

Evaluate Location of Renal Corpuscle

Verify Proportion in Kidney

360° Option Elimination Engine Key Feature

NTA Trap Alert: Corpuscle in Medulla Misconception

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Excretory Products and their Elimination

Henle's Loop Permeability & Counter-Current Mechanism

Substance Transport in PCT (P) and DCT (D) of Nephron

Nephron Types: Cortical vs. Juxtamedullary Nephrons

Regulation of Kidney Function: Osmoreceptors, ADH, and ANF

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