The Skeletal Muscle System. Skeletal muscles are the muscles found in your legs and arms and throughout the body. The skeletal system is different from the smooth muscle system in organs like your liver and the cardiac muscle in your heart because the skeletal muscles contract voluntarily.he skeletal system is different from the smooth muscle system in organs like your liver and the cardiac muscle in your heart because the skeletal muscles contract voluntarily.
With the benefit of breathing pure oxygen first, the current Guinness World Record for holding your breath underwater is held by Ricardo Bahia of Brazil at a whopping 20 minutes 21 seconds! Most people in good health can hold their breath for approximately two minutes.
According to the Harvard University Gazette, the average person can hold his breath underwater for approximately one minute. However, Time Magazine explains that a person in good health should be able to hold their breath for up to two minutes. The current record is held by magician David Blaine, who held his breath for 17 minutes and 4 seconds during a stunt in 2008.