4 . Just how much brain swelling are we talking about ? The volume of a human brain is normally about 1 200 cm 3 . The concentration of solutes in the cerebrospinal fluid the fluid that surrounds the brain and other parts of the central nervous system ) is normally about 300 m A ally 1 30 0mM a Normally . what is the concentration of solutes in your brain cells ? Please explain your reasoning b . If the concentration of solutes in the cerebrospinal fluid