The US in now ranked 46th on the RWB list, in between Romania and Haiti. It was ranked 32nd in the 2013 index. The press freedom group was blunt in its explanation. It cited increased efforts to track down whistleblowers and the sources of leaks, mentioning Chelsea Manning and Edward Snowden in particular.
The heart has four valves-one for each chamber of the heart. The valves keep blood moving through the heart in the right direction. The mitral valve and tricuspid valve are located between the between the atria (upper heart chambers) and the ventricles (lower heart chambers).
Posted on Jun 10, 2013 | Comments 0. A heart valve disease is a kind of a heart condition which occurs when the valves of the heart do not work as they are expected to work. Heart valves are located at the exits of the four heart chambers and help in maintaining the one-way blood flow through the heart. The four valves ensure the fact that the blood always flows in the forward direction and not the backward direction.