Autotomy and regeneration, Biology

Autotomy and Regeneration

Shedding of body parts in self-defense to avert the attention of the predator-enemy or in any other emergency is a type of autotomy (auto: self, tomy: cutting). The most familiar example of autotomy is a breaking off of the tail in the common house lizard between the chordates, but the phenomenon is far much more common among the non-chordates. You have already seen that this takes place is many echinoderms. The star fishes and brittle stars can cast off their arms that can regenerate into whole animals. An extremely interesting case of autotomy followed by regeneration is found in a polychaete annelid worm termed as Chaetopterus. It lives permanently inside a U-shaped parchment tube in the muddy bottom in shallow sea water. If the anterior end of this worm is pulled by a predator a constriction between 12th and 13th segments breaks the body into two pieces. The worm loses its head region to enemy whereas the remaining hind portion is left behind in the U- tube. This hind portion contains the gonads and regenerates the front part needed for normal feeding activity. Chaetopterus has been found to have a remarkable power of regenerating a complete worm from a single isolated body segment that is segment 14.

Posted Date: 2/5/2013 12:45:25 AM | Location : United States







Related Discussions:- Autotomy and regeneration, Assignment Help, Ask Question on Autotomy and regeneration, Get Answer, Expert's Help, Autotomy and regeneration Discussions

Write discussion on Autotomy and regeneration
Your posts are moderated
Related Questions
Explain Food plan for an anaemic pregnant lady? Justification of the Plan: The plan is for an anaemic pregnant lady, from a lower socio-economic level and doing moderate lev

How do antibody-based tests detect how HIV infection works? After the infection by the HIV the immune system starts the production of antibodies (primary immune response) again

write about complementary genes

Limiting Factor - Ecosystem In all ecosystems one factor, usually abiotic, limits the growth of organisms and is therefore called a limiting factor. The limiting factor is one

Using the words 'cilia' and 'mucus', describe, very briefly, how the body gets rid of dust which enters the lungs. The lining of the air passages makes mucus which traps dust p

Explain about the Serum vitamin B12 assay? Serum vitamin B 12 assay: The vitamin B 12 content of serum can be determined.  A serum level of 12 deficiency.

Define Gas liquid chromatography? This is used for separating and identifying volatile compounds of fatty acids, hydrocarbons, sterols, amino acids and lipids, even from nanogr

Q. How does one get infected by Enterotoxigenic escherichia coli gastroenteritis(ETEC)? Infection occurs when a person eats food or drinks water or ice contaminated with ETEC

pls explan 2 puc lesson

Q. What is the difference between type II diabetes mellitus and type I diabetes mellitus? Type I diabetes also known as insulin-dependent diabetes (as this name is not adequate