In the stomach food is further digested and in many fish processed in finger-shaped pouches called pyloric caeca which secrete digestive enzymes and absorb nutrients. For this reason early tetrapods may have experienced chronic hypercapnia high levels of blood CO 2.
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| How Do Frogs Digest Food |
The intestine completes the process of digestion and.
. Tetrapod skin would have been effective for both absorbing oxygen and discharging CO 2 but only up to a point. Fisiologia Animal 3ª Ed. The same limitation applies to gut air breathing GUT ie breathing with the lining of the digestive tract. Organs such as the liver and pancreas add enzymes and various chemicals as the food moves through the digestive tract.
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