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