### body part | tissue | bone | tooth:

Sharp tooth
* Most sharp teeth help diets.
* Sharp teeth are necessary for killing and tearing meat
  - used mainly for tearing and chewing the prey
  - make the prey travel only one way
  - protrude out of sides of mouth
* Some sharp teeth cause injuries
  - serious injuries

Straight tooth
* Straight teeth are easier to care for, more comfortable and have better function.
* Straight teeth are easier to keep clean and healthy
  - clean and less susceptible to tooth decay and gum disease

Tooth brushing
* is the single most effective means of removing plaque.
* removes only about half the plaque on the teeth.

### body part | tissue | bone | tooth:

Tusk
* Most tusks grow throughout lifetimes
  - inflict fatal wounds
* Some tusks are part of boars
  - elephants
  - possessed by elephants
* Some tusks grow skulls
  - throughout lifespans
  - have axes
  - help walruses
  - look like horns
  - serve purposes
* are actually elongated teeth
  - giant incisor teeth, which grow throughout the elephant's life
  - long teeth
  - teeth that grow through their skin
  - also useful to walruses for feeding
  - an elephant's incisor teeth and are the only incisors an elephant has
  - elongated and grow throughout the lifetime
  - enlarged lower and upper canines in males
  - ivory
  - large teeth coming out of their upper jaws
  - like really long pointy teeth that stick out from the upper jaw
  - long teeth made of ivory
* are made of ivory, which is an incredibly dense form of bone
  - occasionally also present in older females
* are part of elephants
  - wild boars
  - simply large teeth that protrude outside an animal's mouth
* are the horns that grow out of the sides of the mouth
  - upper incisor teeth and have been known to grow to lengths of two or three meters
  - tooths
  - used as digging tools, weapons and for displays
* can grow up to ten feet long.
* continue growing for most of the elephants life.
* grow continuously
  - for most of an elephant's lifetime and are an indicator of age
  - from the upper and lower jaws, also larger in males
  - up to seven inches a year and continue growing throughout the elephants' lifetime
* includes bone cells
  - cell membranes
  - corpi
  - cytoplasm
  - enamel
  - ground substances
  - marrow
  - mast cells
  - nuclei
  - plasma membranes
  - pulp cavities
  - root canals
  - sections
  - tooth roots
  - vacuoles
* never stop growing.
* probably play a role in breeding competition.
+ Elephant, Physical description, Teeth: Animals used for transport
  * Elephants also have tusks. Tusks are large  teeth coming out of their upper jaws.
  * Tusks are made of ivory. Ivory is very rare and expensive. Many elephants are killed for their tusks.

### body part | tissue | bone | tooth | tusk:

Elephant tusk
* Elephant Tusks symbolize wisdom, strength, moderation and eternity.
* Most elephant tusks grow throughout lifetimes.
* are very elongated incisor teeth.
* grow continually and absorb carbon and nitrogen isotopes from food

Trabecular bone
* is linearly elastic up to yielding and yields by cracking
  - more metabolically active
  - most involved in diseases such as osteoporosis and in prosthesis fixation
* makes up the interior of bone, and has a spongy, honeycomb-like structure.

Vertebra
* are bones.
* e consist of bones.
* e have delicate membranes
  - spines
* e includes bone cells
  - corpi
  - vacuoles
* e make up backbones
* e protect cord
  - delicate spinal cord
  - nerve cord

### body part | tissue | bone | vertebra:

Cervical vertebrae
* are elongate, but poorly illustrated.
* facilitate the mobility of the head.

Vertebral osteomyelitis
* is an infection of the bones of the spine, the vertebrae.
* means infection of the vertebral bones of the spinal column.
* refers to an infection of the vertebral body in the spine.