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09 Anat notes - ⇒ food gut ⇒ water pharyngeal slits...

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1/12/2009 Anatomy Notes Characteristics of Chordates 1. Hollow, dorsal nerve 2. Notochord -> supporting rod 3. Pharyngeal slits -> present in the pharynx Aka gills (fish), present in human embryos All chordates have these at some point Not everything that have these are chordates 4. Cells that bind iodine to protein (endostyle or thyroid) 5. Heart that pumps blood ventrally in the anterior direction 6. Post-anal tail 7. Segmented Amphioxus: 1. Life style: marine, bottom dwellers 2. Locomotion: Swimming: segmented muscles Burrowing: into sand (b/c of notochord) 3. Feeding: large “mouth” (oral or buccal) cirri” : sensory and mechanical; reject unwanted particles wheel organ -> cilia, create H 2 O current path of food : goes in through mouth pharynx w/ slits (acts like a sieve)
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Unformatted text preview: ⇒ food gut ⇒ water pharyngeal slits atrium • endostyle: o secretes mucus traps food o secretes iodinated proteins o homologous with thyroid gland • food particles get trapped in mucus held in pharynx pass to midgut: undergo digestive processes involving food breakdown • midgut diverticulum (hepatic caecum or diverticulum): o probably homologous w/ liver and pancreas o produces many digestive enzymes • digested food hindgut (for absorption) • fecal matter out the anus • atrium : o space between pharynx and body wall o also receives nitrogenous waste o eggs (females) and sperm (males) from gonads o all go out atriopore...
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