Nervous System. All mental and physical activities are controlled or mediated by the brain and the nervous system. Voluntary actions originate in the brain and the nerves carry the information to other parts of our body.The nervous system relies upon a correct chemical balance in the body.ervous System. All mental and physical activities are controlled or mediated by the brain and the nervous system. Voluntary actions originate in the brain and the nerves carry the information to other parts of our body.
From Wikipedia, the free encyclopedia. Letts is a city in Louisa County, Iowa, United States established in 1855. The population was 384 at the 2010 census. It is part of the Muscatine Micropolitan Statistical Area. The name is from local benefactor, Maddison Letts.
According to our research of Iowa and other state lists there were 2 registered sex offenders living in Letts, Iowa as of August 14, 2016. The ratio of number of residents in Letts to the number of sex offenders is 190 to 1. Median real estate property taxes paid for housing units with mortgages in 2013: $967 (1.3%)