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.
Hypotension is low blood pressure, especially in the arteries of the systemic circulation. Blood pressure is the force of blood pushing against the walls of the arteries as the heart pumps out blood. A systolic blood pressure of less than 90 millimeters of mercury or diastolic of less than 60 mm Hg is generally considered to be hypotension. However, in practice, blood pressure is considered too low only if noticeable symptoms are present. Hypotension is the opposite of hypertension, which is hig