Question

Given the distribution of Na⁺ and K⁺ in animal cells, can you deduce why high sodium in the diet, but not high potassium, causes high blood pressure?

Answer 1

Excessive or high sodium intake in diet can increase blood pressure as it causes NaCl retention by the kidneys and the consequent tedency toward plasma volume expansion lead to hypertension. . Increasing evidence indicates that sodium ingestion in the face of an inability to excrete it normally causes hypertension by releasing a humoral pressor substance. Potassium may be antihypertensive in part by virtue of its ability to stimulate Na+K+ATPase in the vascular smooth muscles cells and in adrenergic nerve endings , thereby causing vasodilation that is decrease in blood pressure .

There for high potassium in diet does not causes high blood pressure .