Kidney tubule base bicarbonate reabsorption and hydrogen ion excretion both tend to alkalinize the blood by acidifying the urine.

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The kidneys play a crucial role in regulating the acid-base balance of the body. The reabsorption of bicarbonate at the base of the kidney tubules removes hydrogen ions from the blood, leading to an increase in blood pH (alkalosis) and a decrease in urine pH (acidosis). This process is known as renal bicarbonate reabsorption and is necessary to maintain the proper balance of acid and base in the body.

Kidney Tubule Base Bicarbonate Reabsorption and Hydrogen Ion Excretion Both