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PHY2042 - Human physiology: Cardiovascular, respiratory and renal systems - S2 2025

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What is it about the sino-atrial node that makes it responsible for setting the heart rate?

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Suggest why Justin's resting heart rate is so much lower than Daniel's.

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What region, in a normal heart, is responsible for setting the heart rate?

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Justin has a friend, Daniel, who is about the same size as Justin but is not very fit. Daniel smokes, is a little overweight and doesn't really do any regular exercise. Daniel's resting heart rate is 70 beats/min. What other difference in resting

heart function would you expect between Daniel and Justin? Why would you expect this difference?

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What two things determine the amount of blood the heart is able to pump around the body per minute?

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