Talk:Buccal pumping

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Costal respiration and air gulping

Costal respiration is breathing with the ribs. According to Jennifer Clack's book Gaining Ground, tetrapod ancetors started with two-stroke buccal pumping. Then tetrapods developed "exhalation powered by hypaxial muscles." The ability to inhale with the ribcage was just getting started in the first amniotes. The diaphragm came much later. Air gulping, meanwhile, is something that fish do when the water is low in oxygen or too high in CO2. They gulp air, which they mix with water and pass through their gills. It's related to buccal pumping. Zyxwv99 (talk) 23:50, 13 July 2015 (UTC)[reply]