Physiological acid-base homeostasis relies on a tripartite regulatory hierarchy consisting of chemical buffers for immediate neutralization, pulmonary ventilation for rapid volatile acid elimination, and renal mechanisms for sustained bicarbonate conservation and new buffer generation. The core theoretical principle is the maintenance of systemic pH within the narrow range of 7.35 to 7.45 to prevent protein denaturation and enzymatic dysfunction caused by hydrogen ion fluctuations derived from metabolic processes. This regulatory framework operates strictly within physiological biochemistry, utilizing specific buffers such as bicarbonate in plasma, hemoglobin-derived histidine residues intracellularly, phosphate, and ammonia in urine, alongside distinct renal pathways involving proximal tubular reabsorption and distal acid secretion via proton pumps or base excretion by intercalated cells.
Physiological acid-base homeostasis relies on a tripartite regulatory hierarchy consisting of chemical buffers for immediate neutralization, pulmonary ventilation for rapid volatile acid elimination,…