Stool water content regulation

Stool water content regulation" refers to the physiological and molecular mechanisms that control the amount of water present in the stool. This involves the absorptive and secretory balance of water and electrolytes across the intestinal epithelium, mediated by several key transporters and channels including CFTR (chloride channel responsible for Cl^- secretion), ENaC (epithelial sodium channel), various aquaporins (water channels), and sodium/hydrogen exchangers (notably NHE3). Disruptions in the regulation can manifest as diarrhea (excess water in stool) or constipation (insufficient water in stool). This process is not attributable to a single receptor, enzyme, or molecular target, but instead to the concerted action of multiple proteins and cellular processes[1][2][5][7][8].