They are primarily responsible for maintaining and changing posture, locomotion, as well as movement of internal organs, such as the contraction of the heart and the movement of food through the digestive system via peristalsis.
Internet Users in the U.S.A. (2016*) 1  Share of U.S. Population: 88.5 % (penetration) 2  Total Population : 324,118,787. 3  Share of World Internet Users: 8.4 4  %. Internet Users in the World: 3,424,971,237.
The percentage of people 18 years and older in the United States who have adopted the Internet over the past two decades has grown at a rate not seen since the popularization of the telephone, soaring nearly fivefold, from 14 percent in 1995.