What is the primary mechanism by which the kidneys maintain acid-base balance in the body?

A Excretion of bicarbonate ions
B Reabsorption of hydrogen ions ✓
C Excretion of ammonia
D Reabsorption of phosphate ions

Explanation

The kidneys play a crucial role in maintaining acid-base balance by reabsorbing hydrogen ions, which helps to regulate the pH of the blood.

Source

Guyton and Hall Textbook of Medical Physiology
Electrolytes and Acid-Base Balance Physiology Renal Physiology Medium MEDICAL Confidence: high