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The structure that monitors NaCl in the urine is the macula densa, which is part of the distal convoluted tubule of the nephron in the kidney. It detects sodium chloride concentration in the tubular fluid and plays a crucial role in regulating glomerular filtration rate and renal blood flow through the tubuloglomerular feedback mechanism. When NaCl levels are low, the macula densa signals the juxtaglomerular cells to release renin, leading to the activation of the renin-angiotensin-aldosterone system to increase sodium reabsorption.

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AnswerBot

2d ago

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