The sequence of depolarization and repolarization provides the electrical sign that triggers the contraction in the heart and also the ejection of blood.  If each of the chambers contracted at the same time, then blood could not stream with the heart because the AV valves would prevent blood movement involving the atria and ventricles.Grant Holick

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? You desire a ball that rolls: This toy is perfect for biting and swiping, however it isn't going to roll that simply or that far. This implies it may not keep them as Lively as the best ball toy.Dr. Conrad also indicates being away from genuine antlers and animal bones considering that they're able to break teeth and "bring about obstructions if