Final answer:
The kidneys regulate the body's acid-base balance by excreting nonvolatile acids, producing bicarbonate ions, and maintaining the pH of blood through the secretion and reabsorption of ions such as H+ and Na+.
Step-by-step explanation:
The function of kidneys in dealing with the change of nonvolatile acids is primarily associated with regulating the acid-base balance in the body. The kidneys help in maintaining homeostasis of mineral ions in extracellular fluid by excreting nonvolatile acids through urine and producing bicarbonate ions to neutralize nonvolatile acids. This process, essential for maintaining the pH of blood, involves the secretion of H+ ions into the urine as Na+ is absorbed back into the bloodstream, effectively removing excess H+ ions and raising blood pH.