In this activity, learners explore the great pump in their chests--the human heart! Learners will determine the amount of blood their heart will beat in their lifetime, their cardiac output (blood pumped per minute) and cardiac index (blood pumped per minute per square meter of body surface area). Extensions in this activity explore correlations between the heart rates of different animals and their body sizes or their longevity. Included are two links to live videos titled "Heart Transplant" and "The Implantation of a Heartmate."

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