Intrinsic control of heartbeat rate involves what mechanism(s) ?
A) The AV node initiates heartbeat although the SA node can generate a slower beat rate.
B) The atrioventricular bundle initiates signals that travel to the Purkinje fibers.
C) The Purkinje fibers initiates signals that travel to the atrioventricular bundle.
D) The SA node initiates heartbeat and the AV node inhibits the heartbeat.
E) The SA node initiates heartbeat although the AV node can generate a slower beat rate.
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