Electrical signals move through the mammalian heart in a particular order. Which order is correct?
A) SA node; internodal pathway; AV node; bundle of His; Purkinje fibers
B) AV node; SA node; internodal pathway; bundle of His; Purkinje fibers
C) SA node; AV node; internodal pathway; Purkinje fibers; bundle of His
D) Bundle of His; Purkinje fibers; internodal pathway; AV node; SA node
Answer: A
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