The heart is made of a unique muscle type known as cardiac and it never tires. But the body also has many other paired muscles, some voluntary that are attached to the skeleton and help the body move, some involuntary that work the internal organs and cannot be controlled.hey are attached to the skeleton and can be controlled. Voluntary muscles have fast twitch and slow twitch fibres. Fast twitch fibres contract quickly, but do not use oxygen well and tire quickly. Slow twitch fibres contract slowly, but use oxygen well and keep going for a long time.
While all boats in the United States must meet minimum standards established by the. U. S. Coast Guard (USCG), the NMMA ensures manufacturers participating in its voluntary certification program adhere to standards set by the American Boat and Yacht Council (ABYC), as well as those of the USCG.
Confidence votes 51.8K. The United States Coast Guard operates under the U.S. Department of Homeland Security during peacetime. However, it can be transferred to the U.S. Department of the Navy by the U.S. President at any time, or by the U.S. Congress during times of war.he Coast Guard operates small boats from shore stations as small as 25 feet up to ice breaking and high endurance cutters of 420 feet in length. -MCG *The United States Coast Guard (USCG) is a branch of the US military.