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.
Rapid, synchronous muscle jerking: Introduction. Rapid, synchronous muscle jerking: also called myoclonus. They are quick, involuntary muscle jerks. See detailed information below for a list of 28 causes of Rapid, synchronous muscle jerking, Symptom Checker, including diseases and drug side effect causes. Â» Review Causes of Rapid, synchronous muscle jerking: Causes | Symptom Checker Â».