for a hands on demonstration with the show's key medical advisor, andrew dennis, a real life trauma surgeon. >> when you look at a trauma patient, when you come in, it looks like a scripted event, where everyone kind of looks for work and they know what to do. apple that's what we have to train everybody here to do. >> the actors went through a medical bootcamp to learn procedures like stitching and cpr and spent time in real operating rooms to see what surgeons actually go through. >> we take care of little toys built so we can come in and be able to look like we know what we're doing. >> reporter: the patients seem pretty real too. >> you can actually reach in and pull these things out. >>. >> reporter: now what is this? >> a liver. >> that's a lung. >> reporter: what this looks like, is very real to scale to what we've seen in an operating room. >> reporter: especially the blood. and there's lots of blood. but remember, it's all fake. >> blood is corn syrup, so it gets -- >> sticky. >> yeah, it does. try to -- >> when we do that, we end up using a lot of lubrication. >> one of the many t