Lab_report_example-1

Lab_report_example-1 - YOUR NAME Planaria and Their...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
YOUR NAME Planaria and Their Regenerative Powers Introduction An invertebrate, by definition, is an animal without a vertebra, what is more commonly know as a backbone. These organisms are very morphologically diverse and live in almost every habitat in the world (Campbell and Reece, 2005). Out of the 35 animal phyla described by biologists, 34 describe invertebrates, and of all the described animal species known to man, 95% are invertebrates (Campbell and Reece, 2005). The invertebrate used in this study is a member of the genus Dugesia , an organism in the phylum Platyhelminthes, more commonly known as flatworms. Platyhelminthes are triploblastic, acoelomates that are bilaterally symmetrical. These organisms are free-living flatworms that generally live in freshwater ponds or streams and feed on smaller animals such as small insects (Reddien and Sánchez Alvarado, 2004; Campbell and Reece, 2005). Since the organisms in this phyla lack a coelom, they do not have a respiratory system or a circulatory system, instead they respire via diffusion (Newmark and Sánchez Alvarado, 2002). Planaria, family Planariidae (class Turbellaria), are very popular specimens in scientific studies due to their regenerative capabilities (Planarium, 2006). Two noteworthy morphological features of Planaria are their two “eyespots” (photoreceptors) located on the anterior, dorsal region (head) of the organism and the opening of the pharynx (mouth) located on the ventral side of the body. Planaria have the ability to regenerate, meaning when a piece of their body is amputated the resulting two pieces “grow back” the lost pieces, creating new Planaria (Lum and Shakhbandaryan, 2006). Something to note is that the cells located just above the photoreceptors and those located at the pharynx are not able to regenerate a complete animal 1
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
because they are post-mitotic structures (Newmark and Sánchez Alvarado, 2002); (Campbell and Reece, 2005). Based on this known information, we hypothesize that each piece of the amputated Planaria will most likely regenerate a head, a tail, or both, depending on which is needed to complete a whole organism. In the case where the Planaria will be cut into 3 pieces, one piece
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern