Ahmed's doctor is concerned about his heart and orders an electrocardiogram. During the test, Ahmed's doctor notices a big spike that reappears over and over between two smaller humps. What does this spike most likely represent?

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MCQs on the physiological processes that occur within the human body, with particular attention on enzyme activity, cell signaling, metabolic processes, protein synthesis, and movement.
 


Ahmed's doctor is concerned about his heart and orders an electrocardiogram. During the test, Ahmed's doctor notices a big spike that reappears over and over between two smaller humps. What does this spike most likely represent?