NEETZoologyExcretory Products and their Elimination
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): As the concentrated filtrate passes upward through the ascending limb of Henle's loop, it gets diluted. Reason (R): The ascending limb of Henle's loop is impermeable to water but allows transport of electrolytes actively or passively. In the light of the above statements, choose the most appropriat
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
Step-by-step solution
Based on the principles of urine formation in the nephron, the ascending limb of Henle's loop is impermeable to water but allows the transport of electrolytes (such as NaCl) outward into the medullary interstitium, either actively or passively. Because solutes are continuously removed from the filtrate while water is trapped inside the tubule, the concentrated filtrate gets progressively diluted as it moves upward towards the distal convoluted tubule. Therefore, both the Assertion and Reason are true, and the Reaso