We Didn’t Evolve for This - Issue 94: Evolving ...Middle East

When a Weddell seal, native to Antarctica, plummets 400 meters beneath the ice on one of its hour-long dives, an ensemble of adaptations come together to keep it alive. The seal’s heart rate slows. At this pace, it will burn through its deep reserve of oxygen—provided by extra-large volumes of blood and hemoglobin—more slowly. The seal’s muscles free massive stores of trapped oxygen from another protein, called myoglobin. If oxygen levels become deficient in its tissues, causing hypoxia, cells can use the high levels of the sugar glycogen stored in its heart and brain to begin anaerobic metabolism, creating energy without oxygen. The seal’s extra-large liver also holds its own store of oxyge

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