a narrow opening produced by cleavage or separation of parts. 2. cleavage (def 1). 3. Anatomy. a natural division or groove in an organ, as in the brain. verb (used with object), fissured, fissuring. 4. to make fissures in; cleave; split.
A diet rich in potassium helps to counterbalance some of sodium's harmful effects on blood pressure. Foods that are good sources of potassium are listed in the Food Sources of Potassium table on the next page.
Sodium is linked to blood pressure and volume, and too much sodium can cause high blood pressure, or hypertension. Therefore, about 60 percent of the population should get no more than 1,500 milligrams of sodium per day to prevent cardiovascular disease.herefore, about 60 percent of the population should get no more than 1,500 milligrams of sodium per day to prevent cardiovascular disease.