Bicarbonate ions (HCO3-) are part of the bicarbonate buffer system in the body. Buffers are important to the acid/base balance in the body. The reabsorption of bicarbonate ions is an important function of the kidneys. Where are bicarbonate ions reabsorbed in the kidney and by what mechanism? (3 points) Group of answer choices In the proximal convoluted tubule, a sodium-potassium antiport system reabsorbs bicarbonate ions by facilitated diffusion In the proximal convoluted tubule, bicarbonate ions are reabsorbed by secondary active transport In the distal convoluted tubule, bicarbonate ions are reabsorbed by cotransport associated with primary active transport of potassium ions In the collecting duct, bicarbonate ions are actively secreted with water