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.
Adair County Iowa. History. Summit Township. This subdivision of Adair county lies in the extreme northwestern corner of the same, and embraces all of congressional township 77 north, range 33 west. It is bounded on the north by Guthrie county, on the west by Cass county, on the east by Walnut township and on the south by Eureka township.