23 October
Bilingual TNPSC Daily Notes on the human excretory system: kidney structure, the nephron, glomerular filtration (125 ml/min, 180 litres a day), selective reabsorption, tubular secretion, the counter-current mechanism, RAAS, ADH, ANF, micturition and haemodialysis – with 15 key points, 5 practice MCQs, memory tips and previous year questions in English and Tamil for TNPSC Group 1, 2, 2A, 4 and VAO.