Triceratops by ~hull612
Controlling the Beating HeartFor the beating of the human heartControlling the Beating Heart by ~5-Hydroxytryptamine
A signal is required to start
Generated in the SAN
Until it is passed on again
Though before this occurs the atria contract
We all know this as a matter of fact.
At the AVN the signal gets ready once more
To continue its journey down the heart's core
Speeding through the Bundle of His
So long as there is nothing amiss
The ventricles receive and force up the blood
Courses throughout the body as the heart goes thud.
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Deviants 
Sta.sh
