Which of the following factors is responsible for the formation of concentrated urine?

In which organ is Henle’s loop found?

Given below are two statements :
Statement I: In the nephron, the descending limb of loop of Henle is impermeable to water and permeable to electrolytes.
Statement II: The proximal convoluted tubule is lined by simple columnar brush border epithelium and increases the surface area for reabsorption.
In the light of the above statements, choose the correct answer from the options given below :

Figure shows human urinary system with structures labelled A to D. Select option which correctly identifies them and gives their characteristics and/or functions.

Human urine is usually acidic because

Which of the following statements is correct?

Which of the following factors is responsible for the formation of concentrated urine?

Which of the following causes an increase in sodium reabsorption in the distal convoluted tubule ?

Given below are statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion : Nephrons are of two types: Cortical & Juxta medullary, based on their relative position in cortex and medulla.
Reason : Juxta medullary nephrons have short loop of Henle whereas, cortical nephrons have longer loop of Henle.
In the light of the above statements, choose the correct answer from the options given below:

Use of an artificial kidney during hemodialysis may result in:
(A) Nitrogenous waste build-up in the body
(B) Non-elimination of excess potassium ions
(C) Reduced absorption of calcium ions from gastro-intestinal tract
(D) Reduced RBC production
Which of the following options is the most appropriate?

In which organ is Henle’s loop found?