The ________ is called the pacemaker of the heart
A) sinoatrial node
B) bundle of His
C) atrioventricular node
D) Purkinje system
A
Explanation:
A) Correct. The heartbeat starts at this node.
B) The bundle of His carries electrical stimuli to the ventricles.
C) The atrioventricular node sends the stimuli to the bundle of His from the SA node.
D) The Purkinje system sends stimuli through the ventricular muscles.
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