<prompt> Mercury affects which part of the kidneyPCTDCTCollecting ductLoop of Henle  <response>: Ans. is a i.e. PCT Pattern in Acute tubular necrosisIschemic typeTubular necrosis is patchy, relatively short lengths of tubules are affected Straight seg. of proximal tubules and ascending limb of Henles loop are most vulnerableToxic necrosis MercuryPCT is mainly involvedLeadEntire tubule is damaged 