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.
  about 36 minutes...the raccoon is actually the land mammal that can hold their breath the longest out of any other land mammal.This feat of evolution is a result of lon â¦ g years as hunted game. If vitally necessary, a raccoon will hyperextend its intercostal muscles and increase vital capacity for a short time.ow long can a human hold his breath? A normal human could hold his breath for 5 minutes one time a human hold his breath for 7 minutes.