How does a constrictor know when to let go?

[RandyRhoads]

Originally Posted by knox

Once the snake squeezes, and the blood pressure spikes out of control, there is no longer a heart beat. The blood is not flowing, so the heart can't contract against the ventricles full of pressurized blood.

^^^ ..Yeah.... not sure what you mean by heartbeat rather than pulse? The electrical firing of the heart..?