Final answer:
E) Gallbladder
The Gallbladder does not play a role in balancing acids and bases in the human body; this function is mainly carried out by the lungs and kidneys.
Step-by-step explanation:
The organ that does not play a role in balancing acids and bases in the human body is E) Gallbladder. The lungs (A) are responsible for removing carbon dioxide, which is part of the body's acid waste, by converting bicarbonate ions into carbon dioxide. The kidneys (B) regulate the concentration of hydrogen and bicarbonate ions in the blood, helping to control the pH level. The central nervous system (C), specifically the brain, does not directly balance acids and bases, but it does not play an active role in pH regulation like the lungs and kidneys. The stomach (D) is involved in digestion and produces gastric acid, but it does not regulate the systemic acid-base balance of the body.