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.
Quitman County is a county located in the U.S. state of Mississippi. As of the 2010 census, the population was 8,223, making it the fifth-least populous county in Mississippi. Its county seat is Marks. The county is named after John A. Quitman, Governor of Mississippi from 1835 to 1836 and from 1850 to 1851.