There is no such position as Mayor of the United States (US). A  Mayor is typically a political position for cities and towns. The  United States is led by a president. Curr â¦ ently, the president is  Barack Obama.
Slow twitch muscle fibres are good for endurance activities like long distance running or cycling. They can work for a long time without getting tired. Fast twitch muscles are good for rapid movements like jumping to catch a ball or sprinting for the bus.
1 Action myoclonus is characterized by muscular jerking triggered or intensified by voluntary movement or even the intention to move. 2  It may be made worse by attempts at precise, coordinated movements. 3  Action myoclonus is the most disabling form of myoclonus and can affect the arms, legs, face, and even the voice.