Nerves and Muscle Control. Muscular System: Muscles are controlled by the peripheral nervous system (PNS), an extension of the central nervous system. The central nervous system (CNS) includes the brain and spinal column. The PNS extends from the CNS, connecting the CNS to the limbs, organs, and other parts of the body. The PNS is divided into the somatic nervous system (SNS) and the autonomic nervous system (ANS). Skeletal muscles are controlled by the SNS, while cardiac and smooth muscles are controlled by the ANS. Read on to learn more about the peripheral nervous system, and its role in controlling the muscular system.
2015 Black Population: 46.3 million, 14.4% of USA. In 2015 US Census Bureau estimated 46,282,080 African Americans in the United States meaning that 14.3% of the total American population of 321.4 Million is Black. This includes those who identify as âBlack Onlyâ and as âBlack in combination with another raceâ.
Most of the increase was people who reported their race as both black and white, a group that rose to 1.8 million last year, compared with 785,000 in the 2000 census. The 130% increase was the largest by percentage among any group or subgroup in the white or black populations, the census information showed. A total of 42 million identified themselves as black alone or in a combination with other races, comprising 14% of the total U.S. population.