EXCRETORY SYSTEM
KIDNEY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The renal pelvis
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The medulla of the kidney
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The cortex of the kidney
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The renal vein
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Detailed explanation-1: -The diluted filtrate enters the distal convoluted tubule, where water and ions are reabsorbed. This slightly increases the filtrate concentration before it enters the collecting duct.
Detailed explanation-2: -Renal Physiology This section of the inner medullary CD expresses urea transporters (UT-A1 and UT-A3), allowing passive reabsorption of urea into the inner medullary interstitium. This process is also under the control of vasopressin (AVP, also known as antidiuretic hormone).
Detailed explanation-3: -As the collecting duct descends through the medulla, the increasing osmolarity in the surrounding interstitial fluid drives water reabsorption. However, there is a tremendous variability in water excretion. The urine produced can either be concentrated, or very dilute.