Federal employees are compensated according to government-regulated pay scales. More than 70 percent of federal employees are paid according to the most common pay scale, the General Schedule (GS) , but there are a variety of alternative pay schedules as well.
Four heart valves control the flow of blood through the heart. They act as one-way doors, opening to let blood exit or enter a chamber, then closing to keep blood from flowing backward. 1  The tricuspid valve controls blood flow from the right atrium to the right ventricle.
The cardiac valves have two functions. By opening, they control the direction in which blood flows and, by closing, they allow pressure differentials to exist in a closed system. Abnormal valve function produces either pressure overloading caused by restricted opening or volume overloading caused by inadequate closure.