The Human Digestive System. Incisors: Soft palate: Tongue: Uvula:
Transcript of The Human Digestive System. Incisors: Soft palate: Tongue: Uvula:
The Human Digestive System
• Incisors:
• Soft palate:
• Tongue:
• Uvula:
• Incisor:
• Canine:
• Premolar:
• Molar:
• Salivary glands produce saliva, a mix of:
• -
• -
• -
• Enamel:• Dentin:• Pulp:• Cement:• Nerve• Blood vessel• Crown• Root
Different skulls
• Tiger• Carnivore
• Raccoon• Omnivore
Different skulls
• Horse• Herbivore
• Omnivore
Different skulls
• Sheep• Herbivore
• Bear• Carnivore
Experiment on digestion
• Use saliva to break down (boiled) starch
• The substance that digests is called: an enzyme
• Test the best temperature for the enzyme to work in
Starch test
• Starch + Iodine solution > blue-black
• Starch + Iodine + saliva >
• Shake holding the test tube in your hand >
• Record the time >
• > solution turns colourless (starch has been digested)
• Test tube (1) boiled starch + Iodine + saliva at body temperature
• Test tube (2) boiled starch + Iodine, kept at 60 degrees C for 10 minutes + saliva
• Test tube (3) boiled starch + Iodine, kept at 4 degrees C for ten minutes + saliva
Tooth decay
Tooth decay
• Formation of plaque
• Acid attacks on enamel
• Enamel dissolves
• Small cavity in the enamel
• Crack in enamel exposes pulp
• Pulp gets infected (pain!)
• Pulp tissue dies, tooth is lost
Tooth decay
• Apply tooth paste
• Brush (circular movements0
• Floss
• Brush
• Rinse
• Brush
• Rinse