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.
Imagine trying to live without a heart. You couldn’t. Your blood stops flowing and your body shuts down. You would no longer be able to draw breath.
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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.
Imagine smelling this smelly sock. Imagine the smelly stench of the dirty sock wafting up into your nostrils and filling your lungs with its odor. Gross.