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 Internet in China. In a report issued in January this year, the governmentâs China Internet Network Information Center (CNNIC) claimed a penetration rate of 42.1 percent. It says China has 564 million Internet users, of whom 277 million access the Internet via a mobile device.