What Would Happen If Your SA Node and AV Node

Multiple Choice

What would happen if your SA node and AV node fired at same time?

A) The QRS wave on an ECG would disappear,as it would be masked by the P wave.
B) Your stroke volume would decrease.
C) Blood would be forced back into the atria from the ventricles.
D) Your blood pressure would increase.
E) The production of nitric oxide by your endothelial cells would increase.