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Homeostasis 4 themes ppt

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Homeostatis 4 themes notes

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Homeostasis 4 themes ppt

  1. 1. B A L A N C E Teacher Notes  Notes can be taken from this PPT on notebook paper.  Certain slides have a leading question in red. The red questions indicate that notes on the data that would answer the question should be taken.
  2. 2. B A L A N C E The Body in Balance  Maintains constant body temperature  Maintains the level of glucose in the blood  Maintains the level of salt, water and sugar in the blood C6H12O6
  3. 3. B A L A N C E So…..  What do we call this maintenance of a balanced internal environment? Homeostasis What is homeostasis?
  4. 4. B A L A N C E 4 Major Themes in Maintaining Balance  These 4 major themes are interrelated to help your body maintain homeostasis: • Feedback loops • Structure and function • Division of labor • Interdependence of organ systems What four themes help maintain homeostasi
  5. 5. B A L A N C E Feedback Loops  How does the thermostat in your home maintain a constant temperature?
  6. 6. B A L A N C E Feedback Loops Thermostat shuts off heater Room temperature falls Thermostat activates heater Warm air is produced Room temperature rises Thermostat feedback loop
  7. 7. B A L A N C E Feedback Loops  What happens to your body when you run outside in 100o temperature?
  8. 8. B A L A N C E Feedback Loops  How does this happen? Blood vessels in skin dilate Sensors in the brain and skin detect a change in body temperature Sweat glands release more sweat Body temperature regulates stimulus response  This is a stimulus-response Hormone message sent
  9. 9. B A L A N C E Feedback Loops  A feedback loop is a stimulus- response action.  An environmental change (the stimulus) produces a reaction (response) to put the environment back into balance (homeostasis). What is a feedback loop?
  10. 10. B A L A N C E Feedback Loops So….What are some of the things that feedback regulates?  Feedback systems regulate: • Blood sugar (glucose) • Salt content in blood • Hormone production • Blood pressure • Ion content in blood • Water content in blood
  11. 11. B A L A N C E Structure and Function  TRY THIS!  Put a rubber band around your hand so that the thumb cannot be used. Pick up your textbook and hand it to the student next to you.  Now - pick up a penny without going to the edge of the desk or putting the penny up against something.
  12. 12. B A L A N C E Structure and Function  TRY THIS!  Continue to not use the thumb. Try to unscrew a lid from a jar.  Pick up your pencil and write your name without using your thumb.
  13. 13. B A L A N C E Structure and Function  Why are these harder to do without the thumb?  What are some other activities that would be difficult without your thumb?
  14. 14. B A L A N C E Structure and Function  How is the structure of your thumb related to its function?
  15. 15. B A L A N C E Structure and Function  One of these represents an original native of Africa.  One of these represents an original native of Alaska.  Which is which and why?
  16. 16. B A L A N C E Structure and Function  What is the function of plant leaves?  Why are these leaves shaped differently? Maple leaf Conifer Cactus
  17. 17. B A L A N C E Structure and Function  The dolphin and the fish are unrelated organisms.  Why do they have similar structures? Mammal - dolphin Fish – Queen snapper
  18. 18. B A L A N C E Structure and Function  The shape (structure) of something affects how it works (function). What is meant by structure is related to function?
  19. 19. B A L A N C E Division of Labor  How many people does it take to build a building?
  20. 20. B A L A N C E Division of Labor  You would need: • Architect • Construction workers • Foreman • Plumbers • Electricians • Painters  Why do you need all of these people?
  21. 21. B A L A N C E Division of Labor  Why do you need so many different parts to digest your food?
  22. 22. B A L A N C E Division of Labor  What do your teeth do for you?
  23. 23. B A L A N C E Division of Labor Esophagus  Why do you need an esophagus?
  24. 24. B A L A N C E Division of Labor  Does the stomach do anything special for you?
  25. 25. B A L A N C E Division of Labor  Could you live without your small intestine?  Why?
  26. 26. B A L A N C E Division of Labor  Your body systems are divided into different parts.  Each part has its own special function.  This is called a Division of Labor. What is division of labor?
  27. 27. B A L A N C E Interdependence of Body Systems  REMEMBER . . .  All the body systems work together to maintain homeostasis.
  28. 28. B A L A N C E Interdependence of Body Systems  What systems need to work together in order for you to write your name on a sheet of paper?
  29. 29. B A L A N C E Interdependence of Body Systems  What systems need to work together so you can get energy from the food you eat?
  30. 30. B A L A N C E Interdependence of Body Systems  What would happen if . . .?  You tried to move your leg with a broken femur?  You had too few red blood cells?
  31. 31. B A L A N C E Interdependence of Body Systems  All the body systems rely on each other in order to function correctly.  If one system fails to work, every system will be affected.  This shows the interdependence of all the systems. What is interdependence of body systems
  32. 32. B A L A N C E Let’s review:  Explain homeostasis and why it is important.  Explain feedback loops and give examples.  Why is structure related to function? Why is surface area a part of structure?  What does division of labor mean?  Why is it important for all of your body systems to work together?

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