Copper rates, and carcass dressing percentages. Chronic copper toxicity does not normally occur in humans because of transport systems that regulate absorption and excretion. Autosomal recessive mutations in copper transport proteins can disable these systems, leading to Wilson's disease with copper accumulation and cirrhosis of the liver in persons who have inherited two defective genes. Elevated copper levels have also been linked to worsening symptoms of Alzheimer's disease. In the US, the Occupational Safety and Health Administration (OSHA) has designated a permissible exposure limit (PEL) for copper dust and fumes in the workplace as a time-weighted average (TWA) of 1 mg/m.
Brain damage permanent, or may not disappear for a long time. There are documented cases of lasting psychological effects as well, such as emotional swings often caused by damage to the various parts of the brain that control human emotions and behavior. Some who have experience emotional changes related to brain damage may have emotions that come very quickly and are very intense, but have very little lasting effect. Emotional changes may not be triggered by a specific event, and can be a cause of stress to the injured party and their family or friends. Often, counseling is suggested for those who