Concentration of urine depends upon which organ?
(a) Bowman’s capsule
(b) length of Henle’s loop
(c) P.C.T.
(d) network of capillaries arising from glomerulus.
option b: length of Henle's loop
descending loop of henle is highly permeable to water but much less permeable to sodium chloride and urea
it passively reabsorbs water from the tubule into the interstial tissues
therefore the osmolarity of flowing fluid (300 mosmo/L of plasma) gradually reaches 1200 mosm/L towards inner medulla
that is why in desert animals like Kangaroo rats have a lengthy loop of henle that helps in saving water and excreting high concentrated urine
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