One of the most essential pieces of knowledge needed to be able to help people in times of medical emergency is a bit of familiarity with the human body itself. After all, if you don’t know the structure and systems therein, how can you expect to be able to be competent at identifying problems and resolving them? Knowing where everything is, and how it all works together is paramount.
For the structure itself, you have a lot of different options available to use to gain familiarity. You can look as books with photographs, see videos (though not for the faint of heart) or use anatomical models to get a good grasp of how everything fits together and where everything belongs. Models work best as they allow you to get a more hands-on experience.
For how everything works, you should pick one system at a time and learn about that system. Say you wanted to learn about the cardiovascular system. You could go online and find plenty of information that will show you how this systems works, no matter what level of knowledge you already have about anatomy. Once you have this one down, move on to another system. Then, start learning how they all fit together so that you can get a complete picture of how the body functions.
It is also important to learn how to treat common problems with each of these systems. You can check out this page for some information on treatments for common first aid problems (we will be expanding this article as time goes on to include more information.
With the proper information and understanding of the human anatomy, you should have no problem dealing with the simple stuff and have adequate knowledge that may prove to be life-saving for the more serious things should they ever come up.