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Author Topic: Large Sea Creatures  (Read 1432 times)

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The 🐳 Blue Whale’s Heart Beats at Extremes
« on: November 28, 2019, 06:07:01 pm »

The Blue Whale’s Heart Beats at Extremes

For the first time, scientists recorded a cardiogram from the largest animal that has ever lived.



Based on equations that apply across mammals of different sizes, a 220-ton blue whale (the largest animal on record) should have a resting heart rate of 11 beats a minute. For comparison, humans have a resting rate of 60 to 100 beats a minute. But Goldbogen found that the very concept of a resting rate doesn’t apply to a blue whale. It’s constantly diving to depths of 150 to 200 meters, feasting on shrimplike crustaceans called krill for 15 minutes at a time, and then resurfacing to reload on oxygen. As it sinks and rises, its heart oscillates between two extremes—very slow or very fast, with nothing in between. (Ba-bum.)

During dives, the whale’s heart rate plummeted to between four and eight beats a minute, and sometimes as low as two. How did the enormous ticker keep blood flowing during those long pauses between beats? The secret lies in the whale’s incredibly elastic aortic arch—the part of the major artery just outside the heart. “Think of it as a balloon,” Goldbogen says.

Full article: 
Rob not the poor, because he is poor: neither oppress the afflicted in the gate:
For the Lord will plead their cause, and spoil the soul of those that spoiled them. Pr. 22:22-23


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