<prompt> A substance is present in concentration of 2mg in the afferent arteriole and zero mg in the efferent. True about the substance isIt is freely filtered in glomerulusSecreted in cortical nephronAbsorbed in PCTImpermeable in loop of Henle  <response>: Ans. a It is freely filtered in glomerulusRef: Ganong, 25th edp.673Concentration of 0 mg means the substance is freely filtered into the bowmans space 