1. Is the fault in the components that perform any physical action?
Answer: Yes
2. Is the fault in components that move?
Answer: No
3. Is the fault in the mechanisms controls?
Answer: No
4. Does the faulty component responsible for visual data acquisition?
Answer: No
5. Is the faulty component used for sensing the location of objects?
Answer: Yes
6. Is the faulty component rigid?
Answer: No
7. Is the fault in critical components of the mechanism?
Answer: No
26) Catfish, Siluriformes
Catfish can be found at the bottom of freshwater habitats on every continent in the world besides Antarctica (Goss). They have barbels, whisker like structures, which contain the taste buds needed for the animal to find its food. If the barbel was to fall of or get cut off the catfish has the ability to regenerate their barbels back to their normal structure.
After the barbel is damaged a blastema made of chondroblasts form over the rod. The thick perichondrium that surrounds the rod becomes thinner as some of its cells are moved into the blastema as well (Goss). The blastema cells proliferate and differentiate into the cartilaginous rod (Goss). Nerve fibers and cells to make the blood vessels have been found to move towards the regenerating site and proliferate as well. Taste buds also differentiate in the epidermis as the rod is regenerating (Goss). Cells will continue to proliferate and differentiate until the barbel has fully grown.
Goss, Richard J. “Regeneration in Fishes.” Principles of Regeneration. New York: Academic, 1969. 113-37. Print.
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