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.
Fast-twitch muscles. Fast-twitch muscles use an 'anaerobic' metabolism to create fuel and need more oxygen, and they are much better at generating short bursts of strength or speed than slow muscles, such as a 100 metre sprint or weightlifting, but they tire more quickly.
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.