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.
Salt is 40 percent sodium, an essential mineral. Although sodium helps regulate blood pressure and blood volume, you need only small amounts daily to support these functions. Too much sodium can raise a womanâs blood pressure, cause bloating and negatively affect sufferers of kidney disease or diabetes.