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Thermoregulation

Thermoregulation. SBI4U. Lesson Outline. What is thermoregulation? Negative Feedback Mechanisms Thermoregulation Daphnia Laboratory Preparation. What is thermoregulation?. The regulation of internal temperatures by negative feedback systems.

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Thermoregulation

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  1. Thermoregulation SBI4U

  2. Lesson Outline • What is thermoregulation? • Negative Feedback Mechanisms • Thermoregulation Daphnia Laboratory Preparation

  3. What is thermoregulation? The regulation of internal temperatures by negative feedback systems. What adaptations (negative feedback systems)do animals utilize to maintain homeostasis?

  4. Adaptations to Thermal Change

  5. Useful Terminology Endotherm: an animal that maintains its body temperature by internal mechanisms. use approx 80% of energy from food to maintain body temperature Ectotherm: an animal that maintains body temperature by absorbing thermal energy

  6. Thermoregulation Daphnia Laboratory

  7. Getting Started • Each group will record a stimulus’s (environment change) affect on daphnia heart rates. • Each group must have 5 different conditions of the same stimulus • You are expected to design your own experiment Ensure you have included variables and control groups.

  8. Recording Heart Rates Requires the use of a microscope. https://www.youtube.com/watch?v=2g-04Uk0ut0 https://www.youtube.com/watch?v=HhOUwlOdxkA

  9. Daphnia Heart Rates Factors Lab Materials: • Sucrose, caffeine, acetylsalicylic acid, ethanol • Daphnia (D. Magna) Clean up: • all waste in waste bottle • clean all glassware after use • clean all droppers Safety: • standard precautions • ethanol

  10. Your lab write-up (formal) • an introduction (any background info you will use later in your report … assume the reader knows Gr 10 Science • a hypothesis (p 710) • the variables (p 707) • the procedure you used* (p 711 … use 2nd person voice) • your clear, concise and complete results (p 708 or 711) • analysis of your results (p 708 … connect your results to the hypothesis and investigation question) • evaluation of your procedure (p 711) • conclusion

  11. Groups Should have Daphnia Test Results completed by Thursday Lab is due Dec 20th

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