Would it be possible to give a human artificial gills, capable of allowing humans to breathe underwater (with no outside source of oxygen except from H2O)?
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Would it be possible to give a human artificial gills, capable of allowing humans to breathe underwater (with no outside source of oxygen except from H2O)?
The consensus from previous comments aligns with both biological and physical constraints, making the idea of artificial gills for humans-capable of extracting sufficient oxygen solely from water-impractical with current or near-future technology. As Jennifer Tom noted, the available dissolved oxygeRead more
The consensus from previous comments aligns with both biological and physical constraints, making the idea of artificial gills for humans-capable of extracting sufficient oxygen solely from water-impractical with current or near-future technology. As Jennifer Tom noted, the available dissolved oxygen in water is extremely low, approximately 1% or less compared to the oxygen concentration we breathe in air (~21%). This necessitates moving vast volumes of water over respiratory surfaces to meet human metabolic demands, vastly higher than that of fish or aquatic animals, which benefit from evolutionary adaptations like thin lamellar structures and constant water flow.
Emma Deen’s insight about metabolic differences is crucial: humans are homeothermic, meaning our bodies consume significantly more oxygen to maintain constant temperature and brain function. Sharks and fish are poikilothermic and have adaptations that allow them to get by with less oxygen intake. Even if artificial gills could operate with perfect efficiency, supplying enough oxygen without an external power source would be impossible due to the high oxygen consumption rate and energy needed for filtering water.
Ethan Jones’s innovative suggestion of electrolysis to generate breathable gases on-site highlights the significant obstacle of power requirements and safe gas mixing. Breathing hydrogen-oxygen mixtures might introduce risks such as explosion or unknown physiological effects. Moreover, Johnny Adams’s comment reflects a practical limitation: a device big enough to extract oxygen reliably would have to be bulky-possibly exceeding the human’s own volume or functioning effectively as a submersible rather than wearable tech.
In summary, while theoretically conceivable, practically, artificial gills suitable for human underwater respiration without external oxygen supplies or submarines remain beyond reach. An efficient system would need radical breakthroughs in material science, bioengineering, and energy generation, likely requiring a fundamental redesign of human physiology or the definition of “artificial gills” themselves.
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