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.
In 2000, 70% of young adults used the internet and that figure has steadily grown to 96% today. At the other end of the spectrum, 14% of seniors used the internet in 2000, while 58% do so today. Not until 2012 did more than half of all adults ages 65 and older report using the internet.