You listen to the heart beating and you hear a "lub-swish- dup".

The swish is caused by:

Select one:

a. A leaky semilunar valve

b. A leaky mitral valve

c. A stenoic mitral valve

d. Closing of the AV valves

One day you learn that this same wealthy friend has become active in a community organization that serves the mentally challenged and their parents. you are told that her work with mentally challenged children consumes most of her weekends and a substantial part of her income and that she lives in modest circumstances. you find this hard to believe, and you suspect that somehow she is profiting from her involvement.