Final answer:
A blue whale's heart weighs about 500 lbs.
Step-by-step explanation:
The heart of a blue whale is the largest heart of any living animal. Blue whales (Balaenoptera musculus), being the largest animals on Earth, have hearts that are proportionally massive. The average weight of a blue whale's heart is estimated to be around 400 pounds (181 kilograms).
A blue whale's heart weighs about 500 lbs. The heart of a blue whale is the largest of any animal, weighing more than 1000 times the weight of an average human heart. Blue whales are the largest animals on Earth, so their hearts need to be large and powerful to pump blood throughout their massive bodies.