What is in a human heart that is not in a pig heart?

Pigs hearts and human heart are extremely similiar, in fact so similar that scientists have deterimined that if a donor heart could not be found for a human, after taking anti-rejection drugs, a pigs...

A human heart differs from a pig's heart by its shape. The heart is shaped more like a trapezoid and the pig's heart is shaped more valentine. The orientation of both hearts are also different.

They are similar in size, anatomy, and function. They both have four chambers and four valves.

It's about the same size and works in the same way. It's even used in schools to teach about the human heart, because it's so similar looking.

no because animals are the same with human and animals don't have life/spirit.