Final answer:
The acid load from nonvolatile acids is primarily managed through the kidneys. They actively secrete H+ ions into the urine to remove excess acid and maintain acid-base balance.
The correct option is 1.
Step-by-step explanation:
The management of acid load from nonvolatile acids is primarily carried out through the kidneys in humans. The kidneys regulate the pH of the blood by adjusting the levels of H+ ions.
They can eliminate excess acid by actively secreting H+ ions into the forming urine as sodium ions are reabsorbed. This helps to raise the blood pH and maintain acid-base balance.
The correct option is 1.