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.
One of the most crucial nutrients your body needs to fight and resist infections is vitamin D. This vitamin plays a big role in helping you avoid and recover from infections. Not only does vitamin D contain antibacterial properties, it also mediates infection-fighting responses in your bodyâs immune system.