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.
On average, Americans say that 33% of the U.S. population is black. In fact, a majority of Americans (56%) estimate that the percentage of blacks in this country stands at 30% or higher. As many as 17% of Americans say the percentage of blacks is 50% or greater.