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.
Homefacts City Report. Florissant is located in St. Louis County, MO. The population is 52,229, making Florissant the largest city in St. Louis County. There are 31 public schools in Florissant with an average Homefacts rating of C. The total crime rate for Florissant is moderate, and there are 192 registered sex offenders residing in the city.