Path followed:
- Is the fault in the components that perform any physical action?
Answer: No
- Is the faulty component part of the mechanism’s body?
Answer: Yes
- Is the faulty component in the structure of the mechanism?
Answer: Yes
- Does the fault appear in components that provide rigidity to the mechanism?
Answer: Yes
- Can the faulty component be removed from the mechanism?
Answer: No
- Is the fault in load bearing components?
Answer: No
- Do multiple versions of the components exist for the faulty component?
Answer: Yes
- Does only one of these components need to be replaced?
Answer: No
118) Shark, Leonodus carlsi
This type of shark lived in the Devonian age but are similar to more primitive sharks. Sharks are able to go through 7-12 sets of teeth each year and are replaced by new teeth waiting in the back of the mouth (ÒSharks, Stingrays and SkatesÓ). Once the teeth have been lost new teeth will take its place through regeneration.
The sharks jaw has a dental lamina which houses special cells for creating teeth. These cells are continuously proliferating and creating tooth buds. These tooth buds enlarge and then poke out of the lamina (Botella et al.). As more teeth are made previously generated teeth are pushed to the jaw margin (Botella et al.). At this point the teeth wait until they can replace any tooth like in a Ôconveyor beltÕ system (Botella
et al.). More research is being done to learn what the special cells are and how they are activated continuously.
“Sharks, Stingrays and Skates.” New Zealand Sharks. National Aquarium of New Zealand, 2014. Web. 6 Jan. 2015.
http://www.nationalaquarium.co.nz/animals-and-fish/new-zealand-animals-and-fish/sharks/
Botella, Hector, Jose I. Valenzuela-Rios, and Carlos Martinez-Perez. “Tooth Replacement Rates in Early Chondrichthyans: A Qualitative Approach.” Lethaia 42 (2009): 365-76. Deepdyve. Web. 6 Jan. 2015.
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