Re: Heartbeat Monitor/Detector

On a sunny day (Wed, 31 Jan 2007 22:20:37 GMT) it happened D from BC
<myrealaddress@xxxxxxxxx> wrote in
<a532s257fa94uvenf9lmobsdoh9t55c8o3@xxxxxxx>:>IIRC I saw a documentary in which heart cells under the microscope
beat..
Also...I've never heard of a head injury so severe that it stopped the
heart..
Without a google search..Maybe the heart still puts out a voltage
detectable on the skin.
What were all those chest wires for in those old hospital movies??

I dunno, Hollywood also had Frankenstein come alive ;-)
But I had a heart test with wires too.
Anyways I looked it up, indeed the heart is 'auto',
http://en.wikipedia.org/wiki/Heart_rate
but there is also a nerve from the brain:
http://en.wikipedia.org/wiki/Vagus_nerve
Just as in electronics things get more complicated the more you look.


I did see that optical thingy on the finger on this weeks episode of
House..
Optical device was mentioned by other posters.

Yes I downloaded Jim's diagram, seems fun.

Guessing at it's construction:
Small view angle LED and phototransistor. Both parts can be SMD.
D from BC

Or you can just feel your pulse.....
I have been in danger situations where for a long time I could just feel my
heartbeat really strong, no need for electronics.
Emergency landing....
hehe
.

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