In this episode, APS Executive Director Martin Frank talks with University of California physiologist John West about snorkeling elephants, galloping race horses and flying pigeons.

Marshall Montrose tells us why the stomach doesn't digest itself.

And finally, Greg Atkinson describes the benefits the afternoon nap may have for your heart. For the study abstract click here.

The intro and outro music for the Life Lines podcast is from Body Notes, composed by Hector Rasgado-Flores and performed by the San Diego Chamber Orchestra.