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.
Smartphones are now responsible for a third of internet access, up from 23% in 2014. Ofcomâs 2015 Communications Data Report shows the success of the devices has been at the expense of laptop computers, the latter dropping from 40% of online connections in 2014 to 30% in 2015.