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.
Looking to sell in â¦ Looking to sell in less than 3 months Looking to sell in 3 to 6 months Looking to sell in 6 months to 1 year Looking to sell in 1 year or more Not sure when to sell. Please send me home values, sold price trends and market analysis for 17782 County Road G40, Letts, IA 52754.