Changes in acid-base balance may cause the kidneys to . a....

Changes in acid-base balance may cause the kidneys to _____.
a. reabsorb and excrete bicarbonate
b. form and release bicarbonate to the blood
c. release ADH
d. either a or b, depending on circumstances

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Key Concepts

Bicarbonate Buffer System

The bicarbonate buffer system is a major mechanism for maintaining pH balance in the blood. Bicarbonate (HCO3-) works in tandem with carbon dioxide (CO2) and carbonic acid (H2CO3) to neutralize excess acids or bases. The kidneys regulate this system by determining how much bicarbonate to reabsorb or secrete, effectively influencing the blood's pH levels.

Renal Regulation of Acid-Base Balance

The kidneys play a key role in regulating acid-base balance by adjusting the excretion or reabsorption of hydrogen ions and bicarbonate. They fine-tune the components of the bicarbonate buffer system by either reclaiming bicarbonate from the filtrate or generating new bicarbonate to be added back to the bloodstream, thereby compensating for changes in the body's acid-base status.

Acid-Base Homeostasis

Acid-base homeostasis refers to the processes by which the body maintains the pH level of the blood and extracellular fluid within a narrow, optimal range. This balance is crucial for normal cellular functions and overall metabolic stability, and it relies on the coordinated actions of various organs, including the lungs and the kidneys, along with chemical buffer systems in the blood.

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