Bernal, Griffith Joyner D._BSBio1-4_Lesson8_Notes.pdf -...

This preview shows page 1 - 3 out of 6 pages.

Vertebrate Digestive SystemDigestive Tractit is a tube from the mouth to the vent or anus that aid in ingestion, digestion,absorption, and egestionmajorsubdivisions:oral cavity, pharynx, esophagus, stomach, large intestines,stomach, cloacaaccessory organs: tongue, teeth, oral glands, pancreas, liver, gall bladderDifferences in Vertebratesoften correlated with the nature, environment, and abundance of foodthe difference between readily absorbed food and food that requires extensiveenzymatic activitythe difference between having a constant food supply and having a scatteredsupply of foodEmbryonic Digestive Tractconsists of 3 regions1.midgut: contains yolk or attached yolk sac2.foregut: contains the oral cavity, pharynx, esophagus, stomach, and smallintestine3.hindgut: contains large intestine and cloacaMouth and Oral Cavitybegins with the organ that aid ingestion, the mouth, and ends at the pharynxfish: have a very short oral cavitytetrapods: typically have longer oral cavitiesMammalian mouth: specialized to serve as a suckling and masticatory organ since ithas the muscular cheekpalate: roof of the oral cavityprimary palate: internal nares lead into the oral cavity anteriorlysecondary palate: nasal passages are located above the secondary palate andopen at the end of the oral cavityTeethderivations of dermal armorplacoidscales:showgradualtransition to teeth at the edge of thejawcomposition teeth: primarily dentinsurrounded by enamelvariesamongvertebratesinnumber,distributionintheoral
cavity, degree of permanence, mode of attachment, and shapetoothless vertebrates: found in every class of vertebratesIncludes agnathans, sturgeons, some toads, turtles, birds, baleen whalestoothed vertebratesfish: teeth are numerous and widely distributed in the oral cavity and pharynxearly tetrapods: teeth are widely distributed on the palatemost amphibians and some reptiles still have teeth on the vomer,palatine, and pterygoid bones

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 6 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Fall
Professor
NoProfessor
Tags
Digestive System

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture