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 aortic valve functions as a one-way valve between the heart and  the rest of the body. Blood is pumped from the left ventricle of  the heart, through the valve, and down â¦ the aorta, which in turn  supplies blood to all of the organs in the body.etween heart  contractions, the valve closes, preventing blood from flowing  backwards into the heart. The function of the aortic valve is then  twofold: (1) It provides a route for which blood can leave the  heart, and (2) It prevents blood that has already left the heart  from leaking backwards into the heart.