UM-Bot Posted February 11, 2003 #1 Share Posted February 11, 2003 Hiccups could be a reminder that our ancient ancestors had gills. The sudden contractions of the muscles used for breathing in serve no purpose in adult humans. The only group of animals which would need it are primitive air breathers like lungfish and other amphibians that still possess gills. New Scientist magazine says these creatures push water across their gills by squeezing their mouth cavity while closing the glottis to stop water getting into their lungs. View: Full Article | Source: Ananova Link to comment Share on other sites More sharing options...
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