Ellis Island was the principal federal immigration station in the United States from 1892 to 1954. More than 12 million immigrants were processed here. Over time, the immigration station spread over 3 connected islands with numerous structures including a hospital and contagious disease wards.
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anaerobic exercise, any short-duration exercise that is powered primarily by metabolic pathways that do not use oxygen. Such pathways produce lactic acid, resulting in metabolic acidosis. Examples of anaerobic exercise include sprinting and weight lifting.xercise at high work intensity during which the needs of muscle metabolism for oxygen exceeds the capacity of the circulation to supply it and an oxygen debt is incurred. anaerobic infection. one caused by aerobic organisms.