Topic 5- Homeostasis

Topic 5- Homeostasis

1. What is Homeostasis?

   • how we maintain a constant internal environment
   • in response to external or internal changes

2. Why we need Homeostasis

   • important for enzyme activity
   • important for cell function
   • controls temperature
   • controls blood glucose
   • controls hydration

3. Negative Feedback Loop

   • Homeostatic control is achieved using negative feedback mechanisms
   • if the level of something rises, control systems reduce it and vice versa
   • the response is the opposite of the stimuli

4. Control Systems

   • The Nervous System
   • The Endocrine System
   • both systems have receptors, coordination centre and effectors
     • receptors- cells that detect changes to the internal or external environment.
       • these changes are known as stimuli
     • coordination centre- receives and processes information from the receptors
       • sends out signals to the effector
     • effectors- muscles or glands that carry out the response to restore optimum conditions