PATHOLOGY MCQ
URINARY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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PCT
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Loop of Henle
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DCT
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Glomerulus
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Detailed explanation-1: -After reabsorption of K+ along the proximal tubule and loop of Henle, approximately 10% of filtered K+ reaches the DCT. As fluid travels down the DCT, the luminal potassium concentration increases, indicating that net K+ secretion occurs along the distal tubule.
Detailed explanation-2: -The distal convoluted tubule (DCT) is a short nephron segment, interposed between the macula densa and collecting duct. Even though it is short, it plays a key role in regulating extracellular fluid volume and electrolyte homeostasis.
Detailed explanation-3: -While the PCT absorbs 70-80% of the water, the remaining 15-20% is reabsorbed in the DCT. DCT reabsorption with the help of the hormone aldosterone maintains sodium and water levels.