<prompt> Erythropoietin isare produced byJuxtaglomerular cellsInterstitial cells of the peritubular capillary bed of the kidneysPars recta of PCTMacula densa  <response>: Ans. b Interstitial cells of the peritubular capillary bed of the kidneysRef. Ganong25th edp.701Major source of erythropoietin is Interstitial cells of the peritubular capillary bed of the kidneys 