ANIMAL DIGESTION

Ms.Tanyaratana Dumkua Biology Department, MahidolWittayanusorn School

What is digestion?

Digestion is a part of food processing. It is a process of breaking food down into molecules small enough for the body to absorb. The processing occurs in digestive tracts.

Why animals do digest?

Where does digestion occur?

Archenteron -> Primitive gut

http://www.macmillanhighered.com/BrainHoney/Resource/6716/digital_first_content/trunk/test/hillis2e/asset/img_ch38/c38_fig10.jpg

https://alchetron.com/cdn/protostome-588e4091-0fd9-48e0-8ffd-998437f9018-resize-750.jpeg

Protostomia & Deuterostomia

https://qph.fs.quoracdn.net/main-qimg-40a7775b19f9bf35ace8b936bda49b48

http://natural-universe.net/wp-content/uploads/2016/07/cnx-2908_Germ_Layers-02-2.jpg

Gastrulation of Mammal

https://biol312.opened.ca/wp-content/uploads/sites/41/2016/02/gastru.png

Gastrulation of Mammal

https://1.bp.blogspot.com/-GT4uLpjL-BI/U5yZHEsyXZI/AAAAAAAAApg/-QOLv-vfYdQ/s1600/Gastrulation.jpg

Primitive gut

https://wrhhs.org/wp-content/uploads/2017/01/Sagittal-sections-through-embryos-at-various-stages-of-development-demonstrating-the-effect-of-cephalocaudal-and-lateral-folding-on-the-position-of-the-endoderm-lined-cavity.gif

https://i.pinimg.com/originals/e2/ac/3d/e2ac3dbfd12774f0a9dcff743660a02d.jpg

https://image.slidesharecdn.com/intoranimallecture8-131116164543-phpapp02/95/intoranimal-lecture-8-20-638.jpg?cb=1384620509

Diploblastic

Triploblastic

No Germ Layers

No Mesoderm Created

https://rbpaonline.com/phagocytosis-flow-chart/immune-system-phagocytosis-flow-chart-375550x2856/

ANIMALS

Have gut No gut

https://images.slideplayer.com/26/8676547/slides/slide_7.jpg https://images.slideplayer.com/36/10571646/slides/slide_12.jpg

Two Type of Digestive Tracts

https://dr282zn36sxxg.cloudfront.net/datastreams/f-d%3A80a1b1b431a4afa7c27e7b652dce4251ba4932f958b1a6c65624be60%2BIMAGE%2BIMAGE.1

Starts with extracellularly, but ends with intracellularly.

Extracellular digestion

https://image.slidesharecdn.com/chapter27-151216035725/95/chapter-27-nutrition-and-digestion-10-638.jpg?cb=1450238303

https://slideplayer.com/slide/7109893/24/images/17/intracellular+digestion+extracellular+digestion.jpg

https://slideplayer.com/slide/8124538/25/images/18/Intracellular+Digestion.jpg

http://pediaa.com/wp-content/uploads/2018/01/Difference-Between-Intracellular-and-Extracellular-Digestion-1.jpg

Intracellular digestion in Amoeba

https://slideplayer.com/slide/1475355/5/images/25/Intracellular+Digestion+in+a+Sponge.jpg

Intracellular digestion in Sponge

https://arayalacy.files.wordpress.com/2011/11/digesthydra2.jpg

Cnidarians: Gastrovascular Cavity

https://slideplayer.com/slide/6224090/20/images/4/Incomplete+Digestive+Tract+of+a+Planarian.jpg

Platyhelminthes: Gastrovascular Cavity

https://images.slideplayer.com/27/9147221/slides/slide_5.jpg http://roundworms.weebly.com/uploads/6/9/4/1/6941123/9390143.jpg?632

Nematodes: Complete gut

Annelids: Complete gut

https://www.kullabs.com/img/note_images/rP28ULdxIZnyNYks.jpg

https://bugwoodcloud.org/bugwoodwiki/thumb/Digestive_system.jpg/400px-Digestive_system.jpg http://www.sfu.ca/biology/courses/bisc317/317%20html/GUT100D.jpg https://eaibugs.files.wordpress.com/2012/05/0203image01.gif

Arthropods: Complete gut

http://heritance.me/wp-content/uploads/anatomy-of-insect-digestive-system-insects.jpg

Arthropods: Complete gut

https://upload.wikimedia.org/wikipedia/commons/8/84/Internal_organs_of_a_fish.jpg

Fish: Complete gut

https://animaldiversity.org/collections/contributors/Grzimek_fish/structure_function/digestive_system/medium.jpg

Fish: Complete gut

https://i.pinimg.com/originals/1d/78/9e/1d789ec5324d390add755b80507c42cc.jpg

Aves: Complete gut

http://www.poultryhub.org/wp-content/uploads/2012/07/Anatomy-of-the-chicken-with-text.jpg https://www.thespruce.com/thmb/Ik-LXNNCO2Zhi_T2MCWyKK6fpLI=/450x0/filters:no_upscale():max_bytes(150000):strip_icc()/gull-big-bite-58a6d31e3df78c345b527334.jpg

https://i.ytimg.com/vi/Fo1R0Oau4Vk/maxresdefault.jpg http://images.slideplayer.com/5/1475355/slides/slide_37.jpg

Aves: Complete gut

https://articles.extension.org//sites/default/files/styles/large/public/labeled_digestive_tract_2.jpg

http://goodfullness.com/wp-content/uploads/2017/04/93342-003.jpg

https://kotosforcongress.com/wp-content/uploads/2018/06/carnivore-digestive-system-diagram-inspirational-parison-of-the-digestive-systems-of-a-herbivore-deer-and-of-carnivore-digestive-system-diagram.jpg

Mammal: Complete gut

https://image.slidesharecdn.com/comparativeanatomydigestivesystem-170207171046/95/comparative-anatomy-digestive-system-4-638.jpg?cb=1486488187

https://www.nextgurukul.in/media/images/q2aanswers/1124658/ruminants_1382694356800.jpg

Ruminants: Complete gut

https://www.mun.ca/biology/scarr/142097_ruminant_digestion.jpg

Ruminants: Complete gut

https://upload.wikimedia.org/wikipedia/commons/thumb/2/2b/Abomasum_%28PSF%29.png/1200px-Abomasum_%28PSF%29.png

Four Chambers in Ruminant

Four Chambers in Ruminant

http://photos1.blogger.com/blogger/4356/576/1600/cowstomach1.jpg