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Rat Digestive System


Digestion begins in Mouth
2 functions: Digestion: chemically & physically break down food into smaller mosequlr units.-----Absorprion: pass digestied food from Digestive system to circulatory system!
2 types of digestion: -Mechanical: food is mixed, chewed & broken down into smaller units-Chemical digestion: enzymes--protines--change chemical make up of the food
Three areas of digestion: salavary glands:Oral CavityAbdominal cavity
Salavary glands: inside throat area:-submaxilary gland: paired glands-drain digestive juices => -Wharton's duct:base of tongue-Stensen's duct: Paraded Glands: drains at upper mholers-Sublinqual Gland: Drains contents at base of tongue and joins at wharton's duct-
Oral Cavity Dentition pattern: determins diet by size, shape and number of teeth.
Rats dentention formula: Incisor=> 1/1 Canines=> 0/0Premholers=>0/0Mholers=>3/31003
Human dentition formula: 2123
Space between cheek and teeth Vestibule
Tongue attatched to back floor of mouth by lingual frenula (2)-paletine rougi
Top of mouth: hard pallett: supported by bone and ridgessoft pallett: muscle =>postiour is the uvula, which only humans have.
Structures that drain into oral cavity Eustacian tubes drain inner ears ito oral cavity:---external nairs:
Tongue: covered by papilli-3 types: anterour-fungiform-postirour: fillaform, adjecent to mholler teeth-circumvallate=> most posterour and the biggest.
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