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Bellringer :

Bellringer :. Today 9/17. Bellringer Summer Assignments Homeostasis Notes Homeostasis Worksheet & Activity Remember: I need WebQuests shared with me! sparkinson@rsd6.org. Maintaining Life. Necessary Life functions Internal things you need your body to do Survival Needs

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Bellringer :

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  1. Bellringer:

  2. Today 9/17 • Bellringer • Summer Assignments • Homeostasis Notes • Homeostasis Worksheet & Activity Remember: I need WebQuests shared with me! sparkinson@rsd6.org

  3. Maintaining Life • Necessary Life functions • Internal things you need your body to do • Survival Needs • External things you need for your body

  4. Homeostasis (pg 8-12) • The ability of the body to maintain a relatively constant internal environment, regardless of environmental changes

  5. Components of Homeostasis: • Variable • Regulated factor or event • Receptor • Structure to monitor situation • Control Center • Structure that determines “set point” • Effector • Carries out response

  6. Example: Homeostasis of Breathing Rate

  7. How it works: • As you accumulate CO2 in your bloodstream, acidity of your blood increases • Receptors in your carotid and aorta sense this, signal to medulla • Medulla signals to diaphragm intercostal muscles- Breathing rate is now increased! • CO2 concentration lessened- acidity decreased

  8. Afferent vs. Efferent Pathways • Afferent Pathway • Signal from receptor to control center • Approach control center • Efferent Pathway • Signal from control center to effector • Exit control center

  9. Negative Feedback Mechanism • Most homeostatic control mechanisms are negative • Prevent sudden, severe changes in the body • Causes the variable to change in a way OPPOSITE the initial change • Nervous System and Endocrine system

  10. Positive Feedback Mechanisms • Causes the variable to change in the SAME direction as the original change • ONE DIRECTION • AKA cascades

  11. Positive Feedback Mechanisms (cont) • Result is a greater change from set point • Typically activate events that are self-perpetuating • Usually not related to maintenance of homeostasis

  12. Homeostatic Imbalance? • DISEASE! • Examples • Fever • Hypertension • Hashimoto’s disease • Graves disease • Kidney Malfunction • Diarrhea

  13. In class… • Find an example of a way the human body maintains homeostasis (text book will help!) • Identify the components • What type of mechanism is it? • What can happen if there is an imbalance of this homeostasis?

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