Chapter 15 Resource: Support, Movement, and Responses

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Name Date Class(continued)Hands-On ActivitiesData and ObservationsSurface Area Estimate: Skin and Newspaper SuitSkin Surface Newspaper Newspaper NewspaperEstimate Length Width AreaConclude and Apply1. Was your estimation correct? Explain.2. How accurate are your measurements of your classmate’s skin surface area? How could yourmeasurements be improved?3. Calculate the volume of your classmate’s skin, using 2 mm as the average thickness and yourcalculated surface area from this lab.Communicating Your DataUsing a table, record the estimated skin surface area from all groups in your class. Findthe average surface areas for both males and females. Discuss any differences in these twoaverages.Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.6 Support, Movement, and Responses
Name Date ClassDesign Your OwnSkin SensitivityLab PreviewDirections: Answer these questions before you begin the Lab.1. What safety symbols are associated with this lab?Hands-On Activities2. What are the receptors called that allow you to sense touch located in the skin?Your body responds to touch, pressure, temperature, and other stimuli. Notall parts of your body are equally sensitive to stimuli. Some areas are moresensitive than others. For example, your lips are sensitive to heat. This protectsyou from burning your mouth and tongue. Now think about touch.How sensitive to touch is the skin on various parts of your body?Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.Real-World QuestionWhch areas can distinguish the smallestamount of distance between stimuli?Form a HypothesisBased on your experiences, state a hypothesisabout which of the following five areas of thebody—fingertip, forearm, back of the neck,palm, and back of the hand—you believe tobe most sensitive. Rank the areas from 5 (themost sensitive) to 1 (the least sensitive).Goals■ Observe the sensitivity to touch on specificareas of the body.■ Design an experiment that tests the effects of avariable, such as how close the contact pointsare, to determine which body areas can distinguishwhich stimuli are closest to one another.Possible Materials3-in ✕ 5-inindex cardtoothpickstape*gluemetric ruler*Alternate materialsSafety PrecautionsWARNING: Do not apply heavy pressure whentouching the toothpicks to the skin of yourclassmates.Test Your HypothesisMake a Plan1. As a group, agree upon and write thehypothesis statement.2. As a group, list the steps you need to test yourhypothesis. Describe exactly what you will doat each step. Consider the following as youlist the steps. How will you know that sight isnot a factor? How will you use the cardshown below to determine sensitivity totouch? How will you determine that one orboth points are sensed?3. Design a data table in your Science Journalto record your observations.4. Reread your entire experiment to makesure that all steps are in the correct order.5. Identify constants, variables, andcontrols of the experiment.10 mm5 mm1 mm3 mmSupport, Movement, and Responses 7
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Chapter 15 Resource: Support, Movement, and Responses

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