||Human Homo sapiens
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||Edmonds CJ. Absorption of sodium and water by human rectum measured by a dialysis method. Gut 1971 12 :356–62.PubMed ID5112170
||"The human colon has a nominal mucosal surface area of
about 2,000 cm^2 (primary source) but in reality the total absorptive area is
even greater because colonic crypt cells are capable of
absorption as well as secretion (ref 4)."