Relation between dietary sodium (Na), extracellular fluid (ECF) volume, and mean arterial pressure (MAP). A, Relation between the dietary intake of Na, ECF volume, and urinary Na excretion at steady state in a normal person. Note that 1 g of Na equals 43 mmol (43 mEq) of Na. At steady state, urinary Na excretion essentially is identical to the dietary intake of Na. As discussed in Figure 2-2, ECF volume increases linearly as the dietary intake of Na increases. At an ECF volume of under about 12 L, urinary Na excretion ceases. The gray bar indicates a normal dietary intake of Na when consuming a typical Western diet. The dark blue bar indicates the range of Na

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