SODIUM ION LEVEL
\sˈə͡ʊdi͡əm ˈa͡ɪɒn lˈɛvə͡l], \sˈəʊdiəm ˈaɪɒn lˈɛvəl], \s_ˈəʊ_d_iə_m ˈaɪ_ɒ_n l_ˈɛ_v_əl]\
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An element that is a member of the alkali group of metals. It has the atomic symbol Na, atomic number 11, and atomic weight 23. With a valence of 1, it has a strong affinity for oxygen and other nonmetallic elements. Sodium provides the chief cation of the extracellular body fluids. Its salts are the most widely used in medicine. (From Dorland, 27th ed) Physiologically the sodium ion plays a major role in blood pressure regulation, maintenance of fluid volume, and electrolyte balance.
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