7. are positive feedback mechanisms useful in nature and the human body? explain. 8. when humans get sick…

7. are positive feedback mechanisms useful in nature and the human body? explain. 8. when humans get sick and the body responds with a high fever of 103°f, would you consider this a positive of negative feedback mechanism? why? 9. in living things when do diseases involve a disturbance of homeostasis? 10. critical thinking: with all crazy weather patterns and natural disasters that have been happening lately, why would some scientists tend blame global warming as the cause? explain your answer in terms of a homeostatic control mechanism.

7. are positive feedback mechanisms useful in nature and the human body? explain. 8. when humans get sick and the body responds with a high fever of 103°f, would you consider this a positive of negative feedback mechanism? why? 9. in living things when do diseases involve a disturbance of homeostasis? 10. critical thinking: with all crazy weather patterns and natural disasters that have been happening lately, why would some scientists tend blame global warming as the cause? explain your answer in terms of a homeostatic control mechanism.

Answer

Brief Explanations:

  1. Positive feedback mechanisms can be useful. In childbirth, uterine contractions are amplified by positive - feedback to expel the baby. In the body, blood clotting is also a positive - feedback process that helps stop bleeding. In nature, some ecological processes like algal blooms can be due to positive feedback.
  2. A high fever of 103°F when sick is usually a positive feedback mechanism. The body raises its temperature to fight off pathogens. The increase in temperature stimulates the immune response further, which in turn may increase the fever more until the infection is under control.
  3. Diseases involve a disturbance of homeostasis when the body's normal equilibrium of physiological processes is disrupted. For example, in diabetes, the body cannot maintain normal blood - glucose levels.
  4. Global warming can be seen as a disruption of the Earth's homeostasis. The Earth has a natural balance of temperature regulation. Human - induced factors like increased greenhouse gas emissions act as a positive feedback in some cases. For example, melting ice reduces the Earth's albedo (reflectivity), causing more heat to be absorbed, which in turn causes more ice to melt, further increasing the temperature.

Answer:

  1. Yes, they are useful. For example, in childbirth and blood clotting in the human body and some ecological processes in nature.
  2. Positive feedback mechanism. The body raises temperature to enhance the immune response against pathogens.
  3. When the body's normal equilibrium of physiological processes is disrupted.
  4. Human - induced factors like increased greenhouse gas emissions act as positive feedback in the Earth's temperature - regulation system, disrupting its homeostasis.