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Unifying Themes:
Homeostasis
All About You
Teacher Education Course
2013-2014
Introducing Michel Siffre!
 Imagine how your body
would respond if you
lived in a camp in an
underground cave.
 How woul...
Responding to Stimuli
 For each stimulus, give the expected response:
 Why do you think we respond to these stimuli?
Sti...
Responding to Stimuli
 Let’s focus on two
examples:
• Waiting for a bus in the
winter
• Waiting for a bus in the
summer
...
Positive Feedback Mechanism
 Our bodies respond to a
stimulus by increasing a
process until
homeostasis is reached
 Exam...
Negative Feedback Mechanism
 Our bodies respond to a stimulus by decreasing a process in order
to maintain homeostasis
 ...
Biological Clock and Circadian Rhythm
Circadian rhythm controls sleep
 Our circadian rhythm controls
many things in our bodies such
as
• body temperature
• hor...
Suprachiasmatic nuclei (SCN)
Circadian and Homeostatic Drive to Sleep
 The homeostatic drive to
sleep is independent
from the circadian drive
to sleep...
Sleep is important!
 “Just as nutritional status,
ambient temperature, level
of stress, blood
oxygenation, and other
vari...
Activity, Part 1
Are You a Lark or an Owl? Questionnaire Scores
Definite
evening
Moderate
evening
Intermediate
Moderate
mo...
Activity, Part 2
 Sleep Journal
Sleep Journal and Sleep Chart Practice
Day Date
Activity one hour
before bed
Time to
bed
Time
awake
Duration of
disruption...
Wrap Up
 How do your sleep patterns demonstrate that
your body is maintaining homeostasis?
 Do you think sleep is a posi...
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Homeostasis

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Students will explore homeostasis.

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Homeostasis

  1. 1. Unifying Themes: Homeostasis All About You Teacher Education Course 2013-2014
  2. 2. Introducing Michel Siffre!  Imagine how your body would respond if you lived in a camp in an underground cave.  How would you know when to go to sleep without the normal cues of night and day?
  3. 3. Responding to Stimuli  For each stimulus, give the expected response:  Why do you think we respond to these stimuli? Stimuli You prick your finger with a pin Waiting for a bus in the winter Waiting for a bus in the summer Touch a hot iron Hear a fire alarm in the same room Responses Pull your finger away Shiver Sweat Pull your hand away Cover your ears
  4. 4. Responding to Stimuli  Let’s focus on two examples: • Waiting for a bus in the winter • Waiting for a bus in the summer  Why does our body react the way it does? • We need to maintain homeostasis, or a state of internal balance
  5. 5. Positive Feedback Mechanism  Our bodies respond to a stimulus by increasing a process until homeostasis is reached  Example: healing a cut
  6. 6. Negative Feedback Mechanism  Our bodies respond to a stimulus by decreasing a process in order to maintain homeostasis  Example: blood sugar levels
  7. 7. Biological Clock and Circadian Rhythm
  8. 8. Circadian rhythm controls sleep  Our circadian rhythm controls many things in our bodies such as • body temperature • hormone secretion • blood pressure • sleep cycles  Although scientists still debate the function of sleep, it is an activity characterized by four main things: • a reduction in physical activity • display a typical body position. In humans, we usually lay down and close our eyes • lowered response to external stimuli • easily reverse the state of sleeping to waking
  9. 9. Suprachiasmatic nuclei (SCN)
  10. 10. Circadian and Homeostatic Drive to Sleep  The homeostatic drive to sleep is independent from the circadian drive to sleep because it is no longer affected by light, it is affected by the history of our sleep
  11. 11. Sleep is important!  “Just as nutritional status, ambient temperature, level of stress, blood oxygenation, and other variables clearly affect the ability to learn, adequate sleep is vital for optimal performance in learning tasks.” – Jerome M. Siegel of the UCLA Department of Psychiatry and Brain Research and the Center for Sleep Research  The University of Chicago conducted a study of volunteer students who only received four to six hours of sleep a night • The students developed higher blood pressure and higher levels of stress hormone • The students also showed some level of slowed metabolism and insulin resistance, which can lead to type 2 diabetes
  12. 12. Activity, Part 1 Are You a Lark or an Owl? Questionnaire Scores Definite evening Moderate evening Intermediate Moderate morning Definite morning 16-30 31-41 42-58 59-69 70-86
  13. 13. Activity, Part 2  Sleep Journal
  14. 14. Sleep Journal and Sleep Chart Practice Day Date Activity one hour before bed Time to bed Time awake Duration of disruption from sleep Total time sleeping How did you feel when you woke up? Sunday 9/23/12 Watching T.V. 11:30 pm 2:30 am 10 min 6 hours and 20 minutes Groggy 2:40 am 6:00 am ---
  15. 15. Wrap Up  How do your sleep patterns demonstrate that your body is maintaining homeostasis?  Do you think sleep is a positive feedback mechanism or a negative feedback mechanism? Why?

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