Heart Maze (Bedroom on Right)

This puzzle really isn't all that tough, as long as you work the maze
backwards.

You'll find that you really only have one choice as to the position of
the switches if you work backwards -- the other position on each switch will
probably block the flow of blood completely.

If you want me to spell out the solution, it's coming up.  But first a word
on how I've drawn the answer.  Draw vertical lines along the walls of the
blood vessels (the vertical walls, that is).  I'll label the lines 1 to 14
from left to right.  Then I'll list the position of each switch whose pivot
point is along these vertical lines from top to bottom.