Mouth and Stomach

structures

The tongue• When you chew food into smaller bits some of

them dissolve into your saliva• Once food particles are in solution the taste buds

on the tongue can detect them• Tongue detects: sweet, sour, bitter,

salty and Umami Papillae

Taste Buds

Tongue

The tooth• Your teeth break your food down into smaller

pieces (remember, scientists call this physical digestion)

• Tooth structure:

Crown

Root

Enamel:Made from calcium. Hardest part of the body

Dentin: similar to bone

Pulp cavity: contains nerves and blood vessels

Root canal

Teeth

Incisors: For biting off bits of food

Canines: For tearing into food (meat!)

Molars: For crushing and grinding food

Premolars: For grinding food

StomachCardiac sphincter

Pyloric sphincter

The stomach is a site of both chemical and physical digestion. The two ends are held closed by sphincters (which close tight like the drawstrings on a hood)

The stomach lining is called the ‘lumen’

Special cells make gastric fluids