In human physiology, the base excess (see: base) excess refers to the amount of acid required to return the blood pH of an individual to the normal value. The value is usually reported in units of (mEq/L). [[{{{diversity_link}}}|Diversity]] {{{diversity}}} Binomial name Homo sapiens Linnaeus, 1758 Trinomial name {{{trinomial}}} Type Species {{{type_species}}} Subspecies Homo sapiens idaltu (extinct) Homo sapiens sapiens [[Image:{{{range_map}}}|{{{range_map_width}}}|]] Synonyms {{{synonyms}}} Homo (genus). ... Physiology (in Greek physis = nature and logos = word) is the study of the mechanical, physical, and biochemical functions of living organisms. ... The common (Arrhenius) definition of a base is a chemical compound that absorbs hydronium ions when dissolved in water (a proton acceptor). ... An acid (from Arabic Azait meaning oil, often represented by the generic formula AH) is typically a water-soluble, sour-tasting chemical compound. ... Red blood cells (erythrocytes) are present in the blood and help carry oxygen to the rest of the cells in the body Blood is a circulating tissue composed of fluid plasma and cells (red blood cells, white blood cells, platelets). ... The correct title of this article is pH. The initial letter is capitalized due to technical restrictions. ...

The term and concept were first introduced by Astrup and Siggard-Andersen in 1958.