Introduction
In this experiment, we wanted to find out if one section of a planarians body is more responsive to touch than the other sections of the body. In the Introduction to Zoology: A Lab Manual, we found that the “Brain” of a planarian and an abundance or “aggregation” of sensory nerve cells are located in the anterior end of its body, making it likely that the anterior would be more responsive to touch than the middle or posterior ends as we hypothesized (Hopkins & Smith, 1997).
Materials and methods The subjects of this experiment were two planarians. They were placed in a single Syracuse dish with a small amount of spring water. Once the planarians settled down we commenced to lightly prodding each planarian. We touched each section of both planarians ten times. Each response to touch from the planarian was recorded. The independent or manipulated variable during this experiment was which section of the body the toothpick touched, the controlled variable was the number of times each section was poked, and the dependent or measured variable was the
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