To physiology ROMK channel are present in p cell of collecting duct & secrete potassium, but you said in bartter syndrome that they are present in ascending Henle limb & resorb potassium
Type II Bartter syndrome results in impairment in the potassium channel (ROMK) affect the transport of potassium and chloride in the thick ascending limb of the loop of Henle (TALH). This results in increased distal delivery of the ions and potassium is secreted.
Ascending Henle loop
Thank you.