generally , prolonged heavy-metal ingestion at these levels resulted in impaired energy metabolism ( e.g. , decreased atp , pcr ; increased pj , adp concentrations ) and altered essential mineral composition ( e.g. , calcium , magnesium , zinc , and to a lesser extent , sodium and potassium ; copper levels were unaffected ) that varied in severity according to the tissue .
C0347988
heavy-metal
C0043481
zinc