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A little wonder, every day

Seals slow their heart rate while diving

Титульна AI-згенерована ілюстрація / AI-generated cover illustration. Northern elephant seal descending below the ocean surface.
оптимізовано з `media/harbor-seal-diving-noaa.jpg`: 1638×1088 px (половина початкової ширини й висоти), JPEG quality 82.
A Cape fur seal swims underwater; photo by Tim Sheerman-Chase.
AI-generated conceptual anatomical scene showing oxygen delivery emphasized for the brain and heart during a dive.
AI-generated scene showing a diving elephant seal beside an unlabeled heartbeat illustration that slows during the dive.
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Титульна AI-згенерована ілюстрація / AI-generated cover illustration. Northern elephant seal descending below the ocean surface.

Listen to fact0:00 / —

During dives, many seals slow their heart rate, a response called bradycardia. Together with the narrowing of some blood vessels, it reduces the heart’s workload and helps conserve limited oxygen stores while maintaining delivery to the brain and heart. The response depends on dive duration and conditions: in freely diving northern elephant seals, heart rate fell more during longer dives.