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Urinary sodium excretion, g/d 2 3 4 5

Sodium intake, g/d intake when consuming a "no added salt" diet. The light blue bar indicates that a "low-salt" diet generally contains about 2 g/d of Na. Note that increasing the dietary intake of Na from very low to normal levels leads to an 18% increase in ECF volume. B, Relation between the dietary intake of Na and MAP in normal persons. MAP is linearly dependent on Na intake; however, increasing dietary Na intake from very low to normal levels increases the MAP by only 1%. Thus, arterial pressure is regulated much more tightly than is ECF volume. (A, Data from Walser [1]; B, Data from Luft and coworkers [3].)

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