Biology_2007_Virtual_Lab_Answer_Key-1

1 based on the results of your investigation what

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completed the lab and on the random data generated by the computer. 1. Based on the results of your investigation, what conclusions can you draw about the relationship between a muscle’s workload and its threshold of stimulation? As the workload on a muscle increases, its threshold of stimulation also increases. 2. Why would a muscle’s threshold of stimulation change as its workload changes? As workload on a muscle increases, the number of muscle fibers that must contract to lift the load also increases. Therefore, the stimulus required to recruit more muscle fibers to lift the load must increase as well. 3. Which muscles were able to contract under the greatest loads? What does this suggest about the role these muscles play in frog movement? The leg muscles (thigh and calf) were able to contract under greater loads than the forelimb muscles. This suggests that a frog’s leg muscles are capable of providing the strong force necessary for locomotion, such as jumping. 4. Describe an experiment you might perform to determine which leg muscles of a frog are important for jumping long distances . An experiment very similar to the one performed in this Investigation could be used to determine which leg muscles of a frog are important for jumping long distances. Individual leg muscles of a frog could be isolated, and their thresholds of stimulation could be determined using the same procedure used to test the muscles in this experiment. 5. What are some advantages of performing this experiment in a simulated environment? The computer simulation can be repeated over and over without harm to live animals. Also, when the experiment is performed in a traditional lab setting, care must be taken to keep the muscle(s) preserved and to counteract muscle fatigue. The simulated environment holds these variables constant to ensure that they do not affect experimental results.
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Lab 27: Blood Pressure Analysis The answers are intended only as samples. Answers also depend on how students completed the lab and on the random data generated by the computer. 1. State a problem about the relationship of age and gender to blood pressure. How do age and gender affect blood pressure averages? 2. Use your knowledge about the heart and the circulatory system to make a hypothesis about how the average blood pressure for a group of people is affected by manipulating the age and gender of the group members. The average blood pressure for a group of people will increase as the average age of the group members increases. The average blood pressure for a group of women will be lower than the average for a group of men of the same age. 3. How will you use the Investigation screen to test your hypothesis? What steps will you follow? What data will you record? To test either of the two hypotheses, first choose a group of men, aged 11–17. Measure the blood pressure of the group and record the average of the ten blood pressure readings (systolic and diastolic). Then, test ten men in each of the other age groups, recording the average blood pressure readings each time. Finally, repeat the procedure
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