This is the kind of thing the Internet should be used for. The great folks over at St. Jude Medical have put up HeartLibrary.com. HeartLibrary has dozens, if not more, interactive videos about the heart, heart conditions, and heart disease. The videos are easy to find, easy to watch, and easy to understand: doctors (real doctors, not fake internet doctors) explain everything in simple terms.
This is huge, because people can get information they need to help them stay healthy or get healthy, and to seek help if they need it. It's not a substitute for seeing your own doctor, but it's a good way to get started and to be informed about one of the most important organs in your body.
If you or someone you know needs more information about the heart, make sure you check out St. Jude's HeartLibrary.com, with videos about the heart, heart conditions like Irregular Heartbeat and more.