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Which term refers to a regularity of the heartbeat?

  1. Refers to cough

  2. Blood vessel

  3. Refers to blood pressure

  4. Refers to regularity of heartbeat

The correct answer is: Refers to regularity of heartbeat

The other options are incorrect because they do not pertain to the regularity of the heartbeat. Option A is related to the respiratory system and option B is related to the circulatory system. Option C is related to blood flow, not specifically the regularity of the heartbeat. The term "regularity of heartbeat" specifically refers to the consistency and rhythm of one's heartbeats. This can also be known as the heart rate or pulse. Therefore, the correct answer is D.