Analysing the Diagram

1. How do members of Congress act as representatives of particular groups of constituents when they do the actions detailed in this quadrant of the diagram?
2. How does the Senate or House act for the American people in general when either does the action detailed in this quadrant of the diagram?
3. How does the House or Senate demonstrate the principle of the separation of powers when it conducts the actions detailed in this quadrant of the diagram?
4. How do the actions detailed in this quadrant demonstrate balance between branches of government?