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Heart
The heart's easy. It's love, or hate, or just a simple beating organ, like the one Preston's exposing.
But that's not heart. Heart is the choice to stay at the hospital, a decade after she's no longer required to, and watch a surgery that she will almost certainly never have to perform. Just to see a miracle happen.
Heart is knowing that miracles don't happen, that almost all of it depends on sheer willpower and a strange talent with sharp, pointy objects.
Heart is seeing the same thing every day and never getting bored.
She wonders why the Tin Man wanted one.
Reference: The Tin Man! Wizard of Oz!