... regions of Africa, the Near East, Asia, and Central and South America, the disease often be-gins with the birth of a second child. The weaned,first-born child must then rely on cereals, often ... passes through the convolutedtubules of the nephron, where most of the sodiumchloride is reabsorbed into the blood. The tubuleshelp regulate the sodium content and the pH of the blood by exchanging ... UREA (the end product of protein degradation), and cre-atinine (the waste product of muscle metabolism).Larger particles like proteins and cells are retainedin the blood by the glomerulus.The...