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.
Heart valves are normally thin, smooth structures that open to allow blood to flow through the heartâs four chambers and then close tight to prevent back flow. If one of them does not function normally, it can cause the heart to work harder and create symptoms such as shortness of breath, dizziness, or chest pain.