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-body interaction shown that brain activity in different brain areas are coupled and form brain networks that can be studied using graph theory. Brain-body interactions can be studied using a similar approach by estimating functional connectivity between brain activity and peripheral electrophysiology, for example between brain activity and ECG, EGG or EMG activity. Synchrony between slow pulse fluctuations (related to sympathetic activity) and brain fMRI signal has revealed a network of sensory brain regions that appear to be relevant for characterizing human personality and emotions. These analyses can be extended to investigate interactions between multiple organ systems that together form a brain-body