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.
Internet usage in South Korea - Important statistics. 1  1. Online access. Countries with the highest number of internet users 2017. 2  2. Online usage. South Korea: weekly internet usage 2016. 3  3. Social media. + Monthly active social media users in APAC countries 2017. 4  4. Online and mobile commerce. South Korea: retail e-commerce sales 2015-2021.