Multiple Choice
The heart contains _____ which prevent the backflow of blood.
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40. Circulatory System
Heart Physiology
Back40. Circulatory System
Heart Physiology
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- Multiple ChoiceWhich of the following systems plays the largest role in regulating heartbeat when at rest?45views
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- Multiple ChoiceWhich structure acts as the primary pacemaker of the heart?47views
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- Multiple ChoiceApproximately how many times does the human heart beat in a single day?28views