Breath
Imagining one’s self without a heart can make it hard to draw breath. Without a heart, you’d have no blood pumping and you would start to die. This would make it increasingly harder to draw breath and get oxygen to stay alive.
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You know how when people are unconscious and their breath slows or comes to a stop, they use smelling salts to revive them? Well a smelly sock (そく) can work just as well. Socks get really stinky and their stench is powerful enough to revive someone who isn’t drawing breath.