Question at position 10 Which of these is the Na+ monitoring cell of the nephron?principal cellnephron loopmacula densavasa recta

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BlackTom AI · Accepted Answer

To approach this question, I will evaluate each option in terms of its anatomical location and function within the nephron.
Option 1: principal cell. These cells are located in the collecting duct and primarily handle Na+ reabsorption and K+ secretion under hormonal control (e.g., aldosterone). While they participate in sodium handling, they are not the specialized Na+ monitoring sensor of the nephron.
Option 2: nephron loop. The loop of Henle concentrates or dilutes urine through actions of the descending and ascending limbs, handling NaCl transport mainly for the purposes of creating a medullary gradient. It is not the sensor that monitors Na+ levels in the tubular fluid.
Option 3: macula densa. This structure is a specialized group of cells in the distal tubule, part of the juxtaglomerular apparatus. Its primary role is to sense NaCl (hence Na+) concentration in the tubular fluid passing by the distal tubule and to signal adjustments to glomerular filtration rate and renin release as part of the tubuloglomerular feedback mechanism.
Option 4: vasa recta. The vasa recta are a network of capillaries involved in countercurrent exchange and blood flow around the loop of Henle. They help maintain the medullary osmotic gradient but do not function as the Na+ monitoring sensor of the nephron.
In summary, while several nephron components participate in sodium handling and fluid balance, the specific cellular structure designated for monitoring Na+ (via NaCl concentration) in the tubular fluid is the macula densa, which acts as the Na+ monitoring cell within the nephron.

Question at position 10 Which of these is the Na+ monitoring cell of the nephron?principal cellnephron loopmacula densavasa recta

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Question at position 10 Which of these is the Na+ monitoring cell of the nephron?principal cellnephron loopmacula densavasa recta

View Explanation

Log in for full answers

Similar Questions

The process of forming urine begins in the:

Which renal hormone contributes primarily to water reabsorption?[Fill in the blank]

The role of the macula densa is to:[Fill in the blank]

If sodium concentration is too high in the filtrate, this implies that GFR is too ______ and causes the ______ of the afferent arteriole.[Fill in the blank]

The role of the macula densa is to:[Fill in the blank]

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Which of the following is NOT a function of the kidney?[Fill in the blank]

Question at position 7 Increased aldosterone would cause:increased reabsorption of Na+increased permeability of the DCT to waterdecreased blood volumedecreased reabsorption of Cl-

More Practical Tools for Students Powered by AI Study Helper

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