ZoologyRenin is released by     

Renin is released by     

  1. A

    JG cells – Crowded cells of DCT

  2. B

    Macula densa – Modified smooth  muscle cells

  3. C

    JG cells – Modified smooth muscle fibres

  4. D

    JG cells – Modified epithelial cells

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    Solution:

    JGA is a special sensitive region formed by cellular modifications in the distal convoluted tubule and the afferent
    arteriole at the location of their contact. Columnar tubule cells in this region are crowded together, and so are known as the macula densa. Along with the macula densa, the wall of the afferent arteriole contains modified smooth muscle fibers called juxtaglomerular cells (JG). A fall in GFR can activate the JG cells to release renin which can stimulate the glomerular blood flow and thereby the GFR back to normal.

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