The ________ is called the pacemaker of the heart
A) sinoatrial node
B) bundle of His
C) atrioventricular node
D) bicuspid
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 bicuspid (mitral valve) allows blood to flow to the left ventricle and closes to prevent its return to the left atrium.
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