ANATOMIA https://hnncbiol.blogspot.com.es/2008/01/sistema-digestivo-i.html
FUNCIONAMIENTO: https://www.niddk.nih.gov/health-information/informacion-de-la-salud/anatomia/aparato-digestivo/Pages/fact.aspx
VIDEO https://www.niddk.nih.gov/health-information/informacion-de-la-salud/anatomia/aparato-digestivo/Pages/fact.aspx
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