Homeostasis

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An introduction to homeostatic biological systems. Thermoregulation and blood glucose levels are used as examples.

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  • Homeostasis

    1. 1. Sir Charles Blagden What are effects of extreme heat on the body? How do we resist heat? See the video
    2. 2. Thermoregulation
    3. 3. Thermoregulation Too hot
    4. 4. Thermoregulation Too hot cc licensed flickr photo by Finizio: http://flickr.com/photos/finizio/492955038/
    5. 5. Thermoregulation Too hot Too cool cc licensed flickr photo by Finizio: http://flickr.com/photos/finizio/492955038/
    6. 6. Thermoregulation Too hot cc licensed flickr photo by MaryLane: http://flickr.com/photos/marylane/520905761/ Too cool cc licensed flickr photo by Finizio: http://flickr.com/photos/finizio/492955038/
    7. 7. Homeostasis of house temperature cc licensed flickr photo by rustybrick: http://flickr.com/photos/rustybrick/2151548025/ cc licensed flickr photo by slworking2: http://flickr.com/photos/slworking/394991055
    8. 8. Homeostasis of house temperature cc licensed flickr photo by rustybrick: http://flickr.com/photos/rustybrick/2151548025/ cc licensed flickr photo by slworking2: http://flickr.com/photos/slworking/394991055
    9. 9. Homeostasis of house temperature Too cold cc licensed flickr photo by rustybrick: http://flickr.com/photos/rustybrick/2151548025/ cc licensed flickr photo by slworking2: http://flickr.com/photos/slworking/394991055
    10. 10. Homeostasis of house temperature Too cold cc licensed flickr photo by rustybrick: http://flickr.com/photos/rustybrick/2151548025/ cc licensed flickr photo by slworking2: http://flickr.com/photos/slworking/394991055 cc licensed flickr photo by Xystance: http://flickr.com/photos/xystance/4278997785/
    11. 11. Homeostasis of house temperature Too cold Too hot cc licensed flickr photo by rustybrick: http://flickr.com/photos/rustybrick/2151548025/ cc licensed flickr photo by slworking2: http://flickr.com/photos/slworking/394991055 cc licensed flickr photo by Xystance: http://flickr.com/photos/xystance/4278997785/
    12. 12. Homeostasis of house temperature Too cold Too hot cc licensed flickr photo by rustybrick: http://flickr.com/photos/rustybrick/2151548025/ cc licensed flickr photo by slworking2: http://flickr.com/photos/slworking/394991055 cc licensed flickr photo by Xystance: http://flickr.com/photos/xystance/4278997785/
    13. 13. Homeostasis of house temperature Too cold Too hot cc licensed flickr photo by rustybrick: http://flickr.com/photos/rustybrick/2151548025/ return temp to normal range cc licensed flickr photo by slworking2: http://flickr.com/photos/slworking/394991055 cc licensed flickr photo by Xystance: http://flickr.com/photos/xystance/4278997785/
    14. 14. Thermoregulation is an example of homeostasis def’n - the property of a system that regulates its internal environment and tends to maintain a stable, constant condition despite changing external conditions
    15. 15. Thermoregulation is an example of homeostasis def’n - the property of a system that regulates its internal environment and tends to maintain a stable, constant condition despite changing external conditions All living things exhibit homeostasis
    16. 16. Homeostatic systems require: a receptor - monitors and responds to changes in the system a control center - sets the range for the condition an effector - produce an action which moves the system back into the desired range
    17. 17. Thermoregulation cc licensed flickr photo by labguest: http://flickr.com/photos/labguest/3467278568/
    18. 18. Thermoregulation
    19. 19. Thermoregulation When too hot: • sweat • vasodilation (blood vessels open up so warm blood can get to surface of skin)
    20. 20. Thermoregulation When too hot: • sweat • vasodilation (blood vessels open up so warm blood can get to surface of skin) When too cold: • shiver • goose bumps • vasoconstriction (blood vessels close up so heat isn’t lost through the skin) • adrenal and thyroid glands - increase overall metabolism
    21. 21. Blood sugar regulation cc licensed flickr photo by EUSKALANATO: http://flickr.com/photos/ 17657816@N05/1971827663/ Receptor (hypothalmus) responds to high blood sugar level Control center (hypothalmus) Sends signal to the pancreas releases insulin cc licensed flickr photo by djneight: http://flickr.com/photos/thedjneight/4119439462/
    22. 22. Effects of insulin • cells absorb more glucose (blood sugar) • liver stores glucose as glycogen • fat storage Lower blood sugar level

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