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But since the original argument was to legislate it on the detection of a heart beat, not the existence of a functional heart and cardiovascular system. And you can detect the heartbeat at 21 days post-conception. And yes, I think it's visible using higher than average power/quality ultrasound devices.
If you by any chance have full text access to medical journals through your work (somehow, possibly) the references in my second link make for some interesting reading, and have more on the instrumentation used to make the measurements, as well as how the age of the fetus was determined (since you rarely have an exact date of conception).
Just realised we were talking about the same thing, you from the date of conception, me from the date of last period... hehe =P
Had a quick scan through it, while interesting the machines kinda lost me, not something I'm used to.
I'm still suprised they are not basing this on brain activity rather than heart activity.
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