Which of the following statements concerning the heart is TRUE? A) The SA Node is the pacemaker because it repolarizes faster than the other auto-rhythmic portions of the heart B ) Insufficient blood flow to the heart is called ischemia C) In 3rd degree heart block, the auto-rhythmic portions of the ventricles set the rate of ventricular contractions, while the SA node sets the rate for atrial contractions D) Both B & C E) All of the above

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