Starfish Regeneration Maddy Hayes & Justin Gaumer
What Is A Starfish? • A starfish is not a fish. It is a echinoderm, which comes from a Greek word meaning “spiny skin.” • There are over 2,000 species of starfish and each varies in size, color, and texture. • It’s genus species is Asteriasruben. • Starfishdo not have a brain and their nervous system is spread throughout their arms. • They also have no blood. Instead, they filter sea water as blood.
Starfish • Starfish have a rigid outside surface made of ciliated epithelium. Substances on their exterior help them to warn off predators. Inside, are tissues and muscles which make up the skeleton. Their reproductive organs are located in the limbs. • Starfish mainly eat muscles. They crack open the shell with a suction cup located underneath of them.
Regeneration • One of the main things that starfish are known for is regenerating their limbs and producing new starfish asexually. • They do this through the process of mitosis.
Prophase • The DNA molecules begin to shorten and condense into coils that form chromosomes. • The nucleus and cell membrane are no longer visible.
Metaphase • The spindle fibers attach themselves to the centromeres of the chromosomes and align the chromosomes at the equitorial plate.
Anaphase • The centromere splits and the spindle fibers shorten. • Sister chromatids that are separated are pulled along behind the centromeres.
Telophase • The chromosomes reach the poles of the spindles that they are supposed to go to. • The nuclear envelope reforms. • The chromosomes uncoil. • The spindle fibers separate.
Cytokinesis • Process where the daughter cells split apart. • The cells gets pinched into two. • Each daughter cell contains the same number and quality of chromosomes.
Regeneration • Through regeneration, starfish can not only regenerate limbs that have broken off, but also the limbs that have been broken off can form into a whole new starfish. • Many times starfish break off their limbs as a form of defense to escape predators, but mainly it is their way of asexually reproducing to form a new starfish.
Process of Regeneration • Healing Phase: The wound where the limb broke off is healed. • Regenerative Phase: The starfish generates new cells and begins to grow. • Advanced Regenerative Phase: The limb really begins to grow. • This process takes about a year to be completed.
How Can This Be Used Today? • To grow limbs for soldiers that have lost body parts in the war or any other circumstance. • Could potentially save more lives.
The Bad. . . • Many people would be upset and protest because they would feel that by creating and growing these limbs for humans, that scientists and doctors are taking the place of God. • Would cost a lot of money for research and studies.
Works Cited Beamer, Victoria. (2010). The Physiology of Arm Regeneration in Starfish. Retrieved from http://www.bio.davidson.edu/people/midorcas/animalphysiology/websites /2010/Beamer/Regeneration.htm Murray, Jim. (2012). Regeneration of Starfish. Retrieved from http://www.newton.dep.anl.gov/askasci/mole00/mole00855.htm Park, Jessica. (2011). Starfish Regeneration. Retrieved from http://www.examiner.com/article/starfish-regeneration