Macula densa refers to . . . . . . .

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(B) The $Macula$ $densa$ is a region of specialized cells located in the wall of the distal convoluted tubule $(DCT)$ where it comes into contact with

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Densely packed cells present in the wall of beginning part of $DCT$

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(B) The $Macula$ $densa$ is a region of specialized cells located in the wall of the distal convoluted tubule $(DCT)$ where it comes into contact with the afferent arteriole of the same nephron.These cells are densely packed and columnar in shape, which gives them their name ($Macula$ $densa$ means 'dense spot').They act as chemoreceptors that monitor the sodium chloride concentration in the tubular fluid and play a crucial role in the regulation of blood pressure and glomerular filtration rate $(GFR)$ through the $Juxtaglomerular$ $apparatus$ $(JGA)$.

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