Final answer:
The heart pumps around 10,000,000 liters or 2.6 million gallons of blood in a 75-year lifetime.
Step-by-step explanation:
The heart pumps approximately 5.25 liters of blood per minute in a resting adult. Over a 75-year lifespan, the heart pumps around 10,000,000 liters or 2.6 million gallons of blood. This is equivalent to about 200,000 tons of blood, which is about 200 times the volume of water in a 6-lane 50-meter lap pool.