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InteractiveDisectionWorksheet - Lab 7 Worksheet Virtual...

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Lab 7 Worksheet: Virtual Frog Dissection Student instructions : Follow the step-by-step instructions for this exercise found on the virtual lab and the instructions below and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus. Please make sure that your answers are typed in RED . Please type your Name and Student ID Number here: Procedure 1. Open the Virtual Lab titled “Virtual Frog Dissection”. 2. If you come upon terms that are unfamiliar to you, please refer to your textbook for further explanation or search the word here: http://encarta.msn.com/encnet/features/dictionary/dictionaryhome.aspx 3. In this exercise, you will be performing a virtual frog dissection. To begin, click on the “Introduction” link on the opening page. Read through and listen to the information presented to learn about the basics of dissection and animal phylogeny. When you are finished, click the “Menu” button at the bottom of the page to return to the opening page of the laboratory activity. If you do not have speakers on your computer, you may follow using the script below. Script: Why Dissect Have you ever wondered about the pathway that food follows through your digestive system after you swallow it? It is difficult to see the organs of your digestive system; however, the human digestive system is similar to the digestive system of a frog. By looking at the digestive system of a frog, you can get a fairly good idea of what a human digestive system looks like. Body systems in humans and frogs are not identical; however, there are similarities. Looking at body systems as you dissect a frog will give you a good idea of how they look and operate. This computer program will allow you to dissect a frog on your computer screen and lead you on a trip about the different body systems of a frog. You will get first hand information about how the frog’s body systems look and function. Natural History Look at this leopard frog’s external or outside anatomy. Its skin is smooth, its top and bottom side show different colorations. The top or dorsal side can be green, grey, or brown. Frogs and humans are both members of the phylum Chordata and sub-phylum vertebrata. All vertebrates have a backbone. Dissection Tools The tools needed for a frog dissection include a dissection pan, pins, scissors, probe, and tweezers. The bottoms of dissection pans are covered in a layer of wax. Pins are used to hold the frog to the bottom of the pan and scissors are used for cutting. The probe and tweezers are used to move organs to the side or lift them to see what lies below. 1
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Fogs live part of their lives on land and part of their lives in water. Frogs developed from eggs deposited in water and hatch into plant eating tadpoles with gills. As their life cycle continues, they loose their tales and gills and develop legs and lungs. Adult frogs spend some of their lives on land using lungs and thin moist skin to breath. Most frogs feed on plants, insects, and other invertebrates.
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