Biological - NIH Office of Science Education - National Institutes of ...

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Do You Y Have Rhythm? Lesson 3 Explore/ Explain Figure 3.1. Animals, like humans, have biological rhythms that determine when they are active. Overview In this lesson, students explore circadian rhythms and biological clocks. First, students read about a Frenchman who lived alone for two months in a cave, and they learn how it affected his sense of time. Second, students analyze their sleepiness scale responses (from their sleep diaries), graph the data, and look for a rhythmic variation in sleepiness and alertness. Students can formulate and test hypotheses using the sleep diary and sleepiness scale database. At a Glance Major Concepts Humans, and many other animals, have an internal biological clock. This clock operates on a cycle of just over 24 hours. Environmental cues, especially light, reset the clock, keeping it in time with the day/night cycles. The clock directs the rhythmic secretion of hormones, such as melatonin, that influence our sleep cycle. If the biological clock becomes out of phase with the environment, various types of sleep problems can result. Objectives After completing this lesson, students will • recognize the existence of biological clocks, • understand the concept of circadian rhythms, 87
Sleep, Sleep Disorders, and Biological Rhythms • describe the relationship between circadian rhythm and sleep/wake cycles, • explain why external cues are required to reset our biological clock, and • understand how disruption in circadian rhythms can affect sleep/wake cycles. Teacher Background Consult the following section in Information about Sleep: 3.5 Biological clock (pages 26–30). In Advance Web-Based Activities Activity 1 2 Web Version? No Yes Photocopies Activity 1 Activity 2 Master 3.1, Michel Siffre Story (Make 1 copy per student.) Master 3.2, The Rhythms of Sleep (Make 1 copy per student and cut the copies in half along the dotted line.) Master 3.3, Sleepiness Scale Graph Template (Make 1 copy per student.) Master 3.4, Thinking about Sleepiness and Sleep Cycles (Make 1 copy per student.) Materials Activity 1 Activity 2 no materials needed computers with an Internet connection Preparation Activity 1 No preparations needed (except for photocopying). 88
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Sleep, Sleep Disorders, and Biologi
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BSCS Development Team Rodger Bybee,
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3.5 Biological clock . . . . . . .
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About the National Institutes of He
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Introduction to Sleep, Sleep Disord
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Implementing the Module The six les
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Content Standards: Grades 9-12 Stan
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Teaching Standards The suggested te
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Using the Student LessonsL The hear
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Using the Web Site The Sleep, Sleep
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Newspaper Articles The Gotham Daily
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Appendix III More About the Nationa
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