How does the brain works?
Answer:
To be totally honest, nobody really knows.
We know that here are sections of the brain that do faultless things. But we don't know why cells know what things they're supposed to do. And we don't really know how memory works (but we know where on earth it is in the brain). And we don't really know how personality form.
Animals know. But we don't.
I think that the brain fires electrical impulse from neurons to control what the rest of the body does. These impulses travel along the nerves and signals the chunk of the body to do something, like contract the muscles within your finger.