HISTOLOGY
URINARY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Potassium ions enter the ____ by ____
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a proximal tubule, diffusion
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proximal tubule, active transport
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distal tubule, diffusion
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distal tubule, active transport
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Explanation:
Detailed explanation-1: -In the proximal tubule, K+ absorption is primarily passive and proportional to Na+ and water (Figure 3). K+ reabsorption in the thick ascending limb of Henle occurs through both transcellular and paracellular pathways.
Detailed explanation-2: -Potassium Transport Along the Nephron Studies on single tubules show that potassium excretion is mediated by three processes: glomerular filtration, reabsorption along the proximal tubule and the loop of Henle, and bidirectional transport (secretion and reabsorption) in the initial and cortical collecting tubule (Fig.
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