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  • Posted By: bb1974
  • Date Posted: 07/14/2011
  • Category: Science
  • Words: 711
  • Pages: 3
  • Views: 583
  • Rank: 234

Comparative Anatomy

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Comparative Anatomy

Bio 202


Introduction


Comparative anatomy is the study between similarities and differences of biological forms within organisms. It is important to study comparative anatomy so we can understand on why organisms vary significantly within their genetic makeup, organization, complexity and appearance(Campbell et al, 2008). Studying the physiology of Rana pipiens (frog) and Procambarus clarkii ( crayfish) can create a broader perspective on how the functions of these two organisms correlate (Campbell et al, 2008). The organism’s dissected R. pipiens and P. clarkii, have physiological variations between their methods of locomotion and digestive tract. Crustaceans diet such as the crayfish feed on plants, insects and small fish making it an omnivore, while frogs mainly eat other animals making it a carnivore (Campbell et al, 2008) Like many crustaceans, the crayfish will eat plants, but along with this their diet consists of clams, snails, as well as insects and small fish (Campbell et al, 2008). Crayfish depend on movement for feeding and respiration, while frogs facilitate movement to run away from predators and to preys (Harrison, 1992). As both organisms have specific usage for locomotion and digestive, I predict that P. clarkii will be more complex with its methods of locomotion and its digestive tract.. On the other hand I predict that R. pipiens will demonstrate a simple digestive tract and a more simple method of locomotion.


Methods


Prior to starting the dissection I analyzed the outer body parts for both animals to become familiar with the structure of the bodies. I used a scapula, surgical scissors, pins and tweezers for the dissection of both animals. Dissections were done according to the manuals prepared by Prete and Nuss (2008a, 2008b)


Results


After the dissection was completed, I found that the frog had an esophagus connected to the stomach, liver, pancreas, small ...

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