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Originally Posted by MrSelfDestruct
If you can learn to controll your heartbeat and blood pressure consciously, I suspect that a reflex action could be controlled consciously. I'd imagine it would be unpleasant to do it too much, and you would risk eye damage by dilating them too much in bright conditions.
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When you say control, do you mean completely (as in, have the ability to stops one's heart)? Because I know it can be controlled indirectly (slowed or speeded up slightly, but not full control), but I've never heard of complete control over one's heart.