Nephron Function & Filtrate Reabsorption — NEET Biology
📚 Practice ConceptJGA, a specialised portion of the nephrons, plays a significant role in the regulation of GFR. Nearly 99 per cent reabsorption of the filtrate takes place through different parts of the nephrons. PCT is the major site of reabsorption and selective secretion. HL primarily helps to maintain osmolar gradient (300 mOsmolL⁻¹ - 1200 mOsmolL⁻¹) within the kidney interstitium. DCT and collecting duct allow extensive reabsorption of water and certain electrolytes, which help in osmoregulation; H⁺, K⁺ and NH₃ could be secreted into the filtrate by the tubules to maintain the ionic balance and pH of body fluids.
Assertion (A): The juxtaglomerular apparatus is important for kidney function regulation. Reason (R): JGA plays a significant role in the regulation of GFR.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
NCERT states “JGA is a special sensitive region formed by cellular modifications in the distal convoluted tubule and the afferent arteriole at the location of their contact” and “JGA plays a significant role in the regulation of GFR.” The Assertion is true - JGA is important for regulation. The Reason explains WHY it’s important - it regulates GFR, which is a key kidney function.
What does NCERT say about JGA specialised portion nephrons?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.