What does that point do? Lung 7

What does that point do?  Lung 7

Acupuncturists are often asked "Why are you using that point?" or "What does that point do?"  So I thought it might be useful for the curious among you to start a series of blog posts talking about specific points, their uses and how you can use them yourself at home. 

The first point in the series is a point on the Lung channel, Lung 7 (LU 7).