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| Question | Answer |
| What is homeostasis? | The maintenance of a constant internal environment. It involves control systems that keep your internal environment roughly constant (within certain limits) |
| What happens when body temperature goes above a certain level? | The vibrations caused by the increased kinetic energy breaks some of the hydrogen bonds that hold proteins in its 3D shape - the proteins denature |
| What happens when body temperature falls below a certain level? | The rate of metabolic reactions slow down |
| What is a negative feedback mechanism? | A negative feedback mechanism is a mechanism that restores a level to normal |
| Name 3 components that are involved in homeostatic systems | Receptors A communication system Effectors |
| TRUE OR FALSE: Negative feedback only works within certain limits | TRUE If the change is too big then the effectors may not be able to counteract it |
| Outline the negative feedback loop |
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| What is a positive feedback mechanism? | A positive feedback mechanism is a mechanism that amplifies a change away from the normal level |
| TRUE OR FALSE: Both positive and negative feedback mechanisms are involved in homeostasis | FALSE Positive feedback is NOT involved in homeostasis because it doesn't keep the internal environment constant. Instead, it is useful to rapidly activate processes in the body |
| Give an example of a positive feedback mechanism in the body | The formation of a blood clot - platelets become activated and release a chemical, triggering more platelets to be activated, and so on |
| Outline the positive feedback loop |
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