This infographic explains how the kidneys purify blood through the nephron, their functional unit. It highlights the three key steps—glomerular filtration, selective reabsorption, and tubular secretion—showing how essential substances like glucose and water are retained while wastes such as urea and excess salts are removed to form urine. A clear, step-by-step visual guide for understanding renal function. #KidneyFunction #Nephron #BloodFiltration #HumanPhysiology #UrinarySystem | Scoolam Founda