Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R . Assertion A: In the human kidney, the vasa recta is absent or highly reduced in the majority of the nephrons. Reason R: The majority of the nephrons have their Malpighian corpuscle, PCT, and DCT situated in the medullary region of the kidney. In the light of the above statements, choose the correct answer from the o

Step-by-step solution

In the human kidney, the majority of nephrons (about 85 % ) are cortical nephrons. In these nephrons, the loop of Henle is very short and extends only very little into the medulla. The vasa recta is absent or highly reduced in cortical nephrons. Therefore, Assertion A is true. In cortical nephrons, the Malpighian corpuscle, Proximal Convoluted Tubule (PCT), and Distal Convoluted Tubule (DCT) are situated in the cortical region of the kidney, not the medullary region. Therefore, Reason R is false. Thus, Assertion A