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.
The world record is currently held by the famous magician and illusionist David Blaine. On an average, a person can hold his or her breath underwater for a very short period of time that is approximately between 45 seconds and 75 seconds (or one minute and fifteen seconds). When a person is immersed in cold water, there is a considerable reduction in the duration of time that a person can hold his or her breath underwater for.