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.
Here's the longest people have survived without air, food, water, sunshine, or sleep. 1  The rule of three minutes without air is a good guideline. Hold your breath for longer, and you run the risk of brain damage. 2  But some people humans can hold their breath for much longer, as is the case of trained free diving. The current world record for static apnea, or holding your breath in water without moving (often face down, unlike this training session), is 11 minutes and 35 seconds, and was set by StÃ©phane Mifsud in 2009.