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* Here a special apparatus called the Juxtaglomerular Apparatus has 3 different structures:
 
* Here a special apparatus called the Juxtaglomerular Apparatus has 3 different structures:
 
** The tubular epithelial cells of the distal tubule which are in contact with the arterioles supplying the glomerulus of that nephron are called the '''macula densa'''.  They play a vital role in the [[Autoregulation of GFR - Anatomy and Physiology#Tubuloglomerular Feedback (TGF)|regulation of the GFR]].
 
** The tubular epithelial cells of the distal tubule which are in contact with the arterioles supplying the glomerulus of that nephron are called the '''macula densa'''.  They play a vital role in the [[Autoregulation of GFR - Anatomy and Physiology#Tubuloglomerular Feedback (TGF)|regulation of the GFR]].
** The [[Juxtaglomerular Cells of The Distal Tubule - Renal Physiology | Juxtaglomerular Cells]] are smooth muscle cells which adjoin the macula densa in the capillary wall.
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** The Juxtaglomerular Cells are smooth muscle cells which adjoin the macula densa in the capillary wall.
 
** The Extraglomerular Mesangium has an unclear function
 
** The Extraglomerular Mesangium has an unclear function
  
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