🔄FROM THE ARCHIVE The world's largest animal has a heart that might sit near the limit of what's possible.
Biologists know that blue whales are the biggest beings on Earth, but notthey’re the largest. Also up for debate: Could a cardiovascular system even support anything larger than these 200-ton beasts?
So biologists and oceanographers from California and Washington gave a 15-year-old blue whale a heart test that many people have had in their own doctor’s office. Called an electrocardiogram, or EKG, it uses electrodes stuck to the skin to measure heart activity. Once the team was close enough to a wild whale, the biologists suction-cupped the device near the whale’s flipper.
The shifting rhythms also give some clues as to how the blue whale heart handles diving stress. The super-slow beats at the bottom of the whale’s dives suggest that the main artery responsible for delivering blood from the heart to the rest of the body stretches to accommodate extreme pressure, the authors write.
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