The officer in the Senate with the power to control the flow of legislation and, in general, to run the chamber (in essence, the functional head of the Senate) is the

The Vice President of the United States.

Explanation:

The Senate of the United States is one of the two houses of the Legislative Branch of the federal government and its total membership goes to 100 while members are called Senators. Every state is represented by two directly elected Senators, instead of by constituencies voting. The Senate is led by the Vice President of the U.S, who as president of the Senate and ntervene on legislation in the condition of a tie vote.

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