Number of Black Senators. March 2, 2010, charm, 1 Comment. How many black senators are there in the U.S.? 1. The present 111 th U.S. Congress has a lone Senator in the person of Rep. Roland Burris of Illinois. This is based on a statistical profile released by the Congressional Research Service in February 2010. To date, there have only been 6 black senators in the U.S. Senate. The first was in Senator Hiram Rhodes Revels of Mississippi who was voted in 1870.
What is a low blood pressure reading? A low blood pressure reading is having a level that is 90/60mmHg, or lower. Only one of the numbers has to be lower than it should be to count as low blood pressure. In other words: if the top number is 90 or less (regardless of the botton number) this may be low blood pressure.
Note that blood pressure readings are expressed as millimeters of mercury. This unit is abbreviated as mm Hg. A normal reading would be any blood pressure below 120/80 mm Hg and above 90/60 mm Hg. Blood pressure that is too low does not supply your body and heart with enough oxygenated blood. Low blood pressure is known as hypotension.