This is a human heart. See how it’s all red and full of blood and throbbing? It’s really gross!
Experts are still not sure what the heart does, but since it’s so icky looking, it can’t be anything good. Our best guess: it’s like that thing that bursts out of that dude’s chest in Alien. That totally happened to a friend of our cousin’s once.
So, beware of your heart. Try to have it removed by a qualified medical professional, before it kills you!