The high osmolarity of the renal medulla is maintained by which of the following?
(A) active transport of salt from the upper region of the descending limb.
(B) the loose packing of juxtamedullary nephrons.
(C) diffusion of urea into the collecting duct.
(D) diffusion of salt from the descending limb of the loop of Henle
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Master Osmoregulation and Nitrogenous Waste with a bite sized video explanation from Jason Amores Sumpter