SCI115 Introduction to Biology
Name: Julie Maxwell
Frog Dissection Virtual lab (Week 9)
Go to the following website for completion:
Instructions: Please follow the virtual dissection lab program systematically, following all of the directions provided verbally in the module. As you progress through the lab exercise, fill in this worksheet, answering the questions. Use as much space as you deem necessary to provide well written complete answers. Begin with the Introduction: Why Dissect, Natural History and Dissection Tools 1.
Describe the general external anatomy of the frog. The body of a frog can be divided into a head, which extends posteriorly to the shoulder region, and a trunk. Notice that a distinct neck is absent. This is a retention of a characteristic of fishes, for which an independent motion of the head and trunk would be disadvantageous during swimming. The appendages, forearms and hind legs, allow the frog to move about on land. The large webbed hind feet aid in swimming. 2.
What does it mean to be a member of Phylum Chordata, Subphylum Vertebrata? fishes; amphibians; reptiles; birds; mammals 3.
Name five dissection tools and their uses.
Dissecting scissors or scalpels will be used to cut open the frog's abdomen. To cut open the frog's abdomen with either dissecting scissors or a scalpel. Forceps and Dissecting Probe To remove or push parts of the frog out of the way in order to view all the organs contained in the lesson plan. Forceps or tweezers allow to pull things out of the way, and grasp parts for cutting. The dissecting probe serves to push organs aside without damaging them. Dissecting Tray and Paper towels Dissecting trays keep the mess contained, and provide a surface on which to cut and stick dissecting pins. Plastic Bag Once the dissection is over to dispose of the carcass. Examine the External Anatomy of the Frog. Please describe each of the following: 4.
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