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.
During peacetime, the Coast Guard is a part of the Department of Homeland Security, whereas the other military services are a part of the Defense Department. However, during war or by order of the president, oversight of the Coast Guard can be transferred to the U.S. Navy.nlike the other military services, the USCG isnât represented by a flag officer on the Joint Chiefs of Staff. The United States Coast Guard Academy is the higher education institution for the USCG, comparable to the academies that serve the other branches of the military. Itâs based in New London, Conn.