Final answer:
The average human heart weighs about 0.55 to 0.77 pounds, with females on the lighter side and males slightly heavier. Athletes may have hearts that weigh more due to hypertrophy from rigorous training.
Step-by-step explanation:
The weight of the human heart in pounds varies between individuals. On average, the weight of a female heart is roughly 250-300 grams (9 to 11 ounces), and the male heart is about 300-350 grams (11 to 12 ounces).
Using the conversion factor where 1 pound is equivalent to 453.6 grams, the weight of the heart in pounds can be calculated. An athlete's heart can be heavier, up to about 500 grams, due to hypertrophy, which is an increase in the size of cells rather than the number of cells.