The Vice President of the United States is the presiding officer in the Senate. It is only in the absence of the Vice President that the president pro tempore is empowered to preside.
President pro tempore is the presiding officer of US senate. His responsibility is to maintain order and decorum of the house and its regulations. Normally the senior most senator from majority party is elected as President pro tempore.
The president pro tempore presides when the officer of the Senate is away. This person is the second highest ranking official of the Senate.
If you are asking about the Presidential succession list, The Secretary of State is next in line after the President pro tempore. If the president pro tempore dies or resigns his office , a new pro tempore would be elected by the Senate. If a senator is too sick to serve but does not resign, nothing is done.
The Vice President of the US is the Senate President, however, he can appoint or delegate any of the senators to officiate on his absence which is called the President's Pro Tempore. The 113th Congress Presidents Pro Tempore as Jan 3, 2013 is Patrick J. Leahy.
== == == == the presiding officer in the senate is the vice president president of the senate
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The US Senate.
The president of the state Senate is the presiding officer of a Senate. He is the successor of powers and responsibilities of the President.
In the U.S. the current presiding officer is Joseph Biden (the vice president)
The Presiding officer of the US Senate is the Vice president of the United States, but his title in the Senate is President of the Senate. The presiding officer of the House of Representatives is called the Speaker of the House.
The Vice President of the United States is the presiding officer in the Senate. It is only in the absence of the Vice President that the president pro tempore is empowered to preside.