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Final answer:
When a football player goes from Miami to Denver, his heart rate and cardiac output will initially increase due to the lower oxygen concentration at higher altitudes.
Explanation:
Initially, when a football player goes from Miami (sea level) to Denver (mile-high altitude), his heart rate and cardiac output will increase due to the decreased oxygen concentration in the air. This is a compensatory physiological response to the lower oxygen levels at higher altitudes. The body tries to supply more oxygen to tissues by increasing heart rate and cardiac output.
Learn more about High-altitude physiological effects here:
https://brainly.com/question/39282950
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