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Date Posted: 11:19:37 12/15/05 Thu
Author: anom
Subject: magic or mystery, sure
In reply to: MGD 's message, "Re: It's magic!" on 02:37:25 12/15/05 Thu

Note: This turned into more of an anatomy lesson than I'd planned. You Have Been Warned.

Sounds like you're thinking of "capillarity" (capillary action). I don't think (not sure, though) this is the way blood moves through the capillaries--they're so narrow the blood cells pass through in single file, so the blood may not even be acting as a liquid there. But heart contractions are definitely what send the blood through the arteries. In the veins, it's contraction of the muscles around them that moves the blood back toward the heart. This wouldn't be enough if the veins didn't have valves to keep blood from flowing back down.

Arteries don't have them, though, so if the heart isn't beating, anything above it would be hard to get blood to by the extra-strong muscle contractions I mentioned in "venous fly?" Good thing for living humans it's not that long a distance from the heart to the head, so a beating heart can normally manage it.

But capillarity only works w/very narrow tubes. The heartbeat is what sets the blood flowing through the arteries, & the action of the body's muscles is what sends it back. So how blood moves in vampires' bodies is still an open question.

Of course, the magic clause comes in very handy here. @>)

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