Pigs could be used to grow human organs used for transplant. Stem cells from a human recipient can be implanted to an animal which would then grow the organ.
Pigs anatomy is similar to human anatomy. Basically the internal cavity of the pig is very similar to that of a human, it is only smaller. The heart is located at the same place, between the lungs, the liver and a gall bladder look almost like the humans, and the whole digestive system is extremely similar to humans’ digestive system.
Read more on this stem cell breakthrough in The Telegraph