What keeps Tony Stark alive?

What keeps Tony Stark alive? When he came to, he found an electromagnet attached to his chest, keeping the shrapnel from reaching his heart and killing him. It’s therefore actually the electromagnet that keeps Tony alive, not the arc reactor.

When he came to, he found an electromagnet attached to his chest, keeping the shrapnel from reaching his heart and killing him. It’s therefore actually the electromagnet that keeps Tony alive, not the arc reactor.