Chewing and Swallowing

Digestion starts when Amy takes a bite of her burger, chews, and swallows it. Chewing starts the breakdown of food to a manageable size that can pass into the cells lining the digestive tube. When she bites into her food, teeth called incisors cut the burger and bun into bite-size pieces of food. Other teeth called canines, or eyeteeth, help her tear off some of the food into her mouth. When she chews, she uses premolars and molars, or wisdom teeth, to grind the food into a pulpy consistency called a bolus. This bolus is a mixture of saliva and the ingested food. Her tongue moves the food around in her mouth, from side to side, and eventually, toward the back of her mouth so she can swallow the bolus.

0 0

Post a comment