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.
However, according to a December study by the Pew Internet & American Life Project, 4 percent of American adults still use a modem to get online. Thatâs more than 10 million people accessing the Web at 56.6 or slower speeds.