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.
While the average amount of time spent watching TV and on computers has not changed much over the years, people are spending more time online on their phones. This year 61 percent of American cell phone owners were using smartphones up from 21 percent in 2010, according to Nielsen. Just because people aren't watching more TV on their television sets over the years, that doesn't mean they aren't watching more TV online. Netflix gained 630,000 subscribers in the U.S. in just 3 months in 2013, bringing the online television and movie site to 29.8 million U.S. subscribers.