This animation, although not very anatomically correct, gives a nice visual of how the S-A and A-V work. What makes it even better and helpful is the step-by-step process the animation shows.
Another animation of the heart during systole and diastole. I thought this animation was just awesome. You can see everything working through all the phases of systole and diastole.
Although kind of long, the video below lets you listen to various heart sounds, which made it helpful to compare and contrast the different sounds.
