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.
Experts say the rural-versus-urban shift has been ongoing for decades in Iowa and the Midwest as residents move to areas with more employment and a higher concentration of services. Dallas County, which contains Des Moines' western suburbs, is the fastest-growing county in the state, with 13,996 new residents since 2010. Johnson County, which includes Iowa City and Coralville, showed the second-fastest growth, followed by Polk County. Dallas County's population rose 21.2 percent in five years.