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.
While sleeping, a red ear slider can hold its breath for a couple of hours. When awake, it can hold its breath for about a half an hour.owever, the fin whale can hold its breath for up to twenty minutes, whereas the giant sperm whale can hold its breath for as long as two hours (though the average duration seems to be about forty to ninety minutes).