5 Teeth, tongue and palate mechanically break down large food particles into small food particles. Saliva moisturizes and lubricates the food. Salivary amylases begin the chemical digestion of large starch and glycogen chains into smaller chains carbohydrate chains.
14 Mouth structures: Teeth! Used for the mechanical breakdown of food!
15 The dentin is similar to enamel but not as hard. Adds support. Enamel is crystalline calcium phosphate, the hardest substance in the body. Only visible layer. Created by ameloblast cells.The dentin is similar to enamel but not as hard. Adds support.The pulp is connective tissue with blood vessels and nerves. Odontoblasts produce dentin.Cementum is a “glue” layer produced by cementoblasts.15
16 Human teeth include the incisors, the canines, the premolars & the molars.
17 Human TeethIncisors (8): front flat teeth, very sharp. Adapted for cutting and shearing.Canines (4): also called cuspids or fangs are long, pointed teeth that evolved for holding food in place. 4 in total.Premolars (8): also called bicuspids are transitional teeth between canines and molars. Used for mastication (chewing).Molars (12): have four cusps. Used for grinding and crushing food. Last molar is the wisdom tooth.
18 Human teeth anchor in the bone via the root Human teeth anchor in the bone via the root. Nerves and blood vessels keep them supplied and controlled.
19 Original 20 teeth begin to be replaced at around age 7.
22 Adult humans have 32 teeth. Notice how the wisdom teeth no longer lock in place
23 Wisdom teeth are vestigial structures left over from when our ancestors had a more herbivores diet. The jaw doesn’t have enough space for wisdom teeth, and so as they grow they may become impacted and may have to be surgically removed.
24 Teeth arrangement and size indicates the diet of the organism.
25 Ominovorous dietOmnivores: Incisors to tear, molars & premolars to crush, canines to hold.