<prompt> A substance is present in a concentration of 2mg in the afferent arteriole and zero mg in the efferent. True about the substance isIt is free filtered in glomerulusSecreted in cortical nephronAbsorbed in PCTImpermeable in loop of Henle  <response>: Afferent arteriole was having the substance. After it passed through the glomerulus, in the efferent arteriole it is absent. That means all of it was filtered out through the glomerulus. 