Biology Lab

Assignment 5: Muscle Stimulation1) Click on the link to open up the virtual lab:http://www.mhhe.com/biosci/genbio/virtual_labs_2K8/pages/MuscleSimulations.html*2) Click “Instructions” to open the instructions.3) Click “Laboratory Exercise” to open the virtual lab. (It will open in a new tab.)* Read the information paragraph provided. This paragraph will also be available during the lab by clicking the information button on the lower right-hand side of the lab screen.4) Read the procedural instruction on the left side of the screen.5) Follow the instructions provided.Additional instructions: Please make sure you have read through all of the information in the “Question” and “Information” areas. 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.aspxIn this exercise, you will use an oscilloscope to examine the effect of varying load (weight) on frog skeletal muscle action. To begin, click on the pull down menu of the “Muscle” button to select the type of muscle you would first like to test. Making sure that the oscilloscope is set to “0V”, click the “Apply Stimulus” button. As you do so, pay close attention to the trace readout on the screen; you are looking specifically for a spike in the straight line to be produced. If no spike is observed, use the upward pointing arrow on the oscilloscope to increase the voltage to the next highest level and then click “Apply Stimulus”. Keep repeating this procedure until you observe the production of a spike in the oscilloscope trace readout. At that point, note the voltage in the “0g” load weight in your “Data Table” and/or in Table I below.NOTE: If no spike is observed, be sure to click “Apply Stimulus” at least 3 times to make sure the muscle received the stimulus properly.When you are through, you will then need to repeat the above steps using the varying loads (weights). To do so, drag the 5g weight to the hook attached to the frog muscle and then proceed as you did to test the muscle action in step 2 above. When you are through testing the 5g weight, repeat these steps using each of the four remaining loads.When you are completely finished testing all variables for the muscle type selected, you will need to repeat this procedure for ALL three remaining muscle types. Remember, you can always click the “Reset” button to clear your experiment and start fresh. Be sure to appropriately note all of your data in the “Data Table” or in the data table in the assignment question sheet.6) Fill in the data table(s) and answer the questions in the following link: /uploads/185Assignment_5_Question_Sheet.pdf(https://nationalparalegal.edu/uploads/185Assignment_5_Question_Sheet.pdf)7) Submit your answers via the section of the student menu entitled “Assignments and Exams.”* If the URL does not work, try: http://glencoe.mheducation.com/sites/dl/free/00788…

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