Homeostasis

• constant external environmental changes = constant changes to internal environment
• The internal environment needs to stay the same as much as possible as too much change can cause sickness and in some cases death
• Managed internally : blood temperature, blood pressure level, blood glucose level
• Homeostasis is keeping stable internal environment
• Effectors in the body work to bring the body back to homeostasis state after changes caused by the stimulus
• 1. sensory receptors pick up stimulus
  2. Control centre is alerted
  3. Effectors are fired to manage stimulus
  4. Stimulus corrected to bring back homeostasis
• Negative feedback is the process that cancels or takes away stimulus. The response is opposite to the stimulus
• receptor -> control center -> effector
• Positive feedback forces organism out of homeostasis by amplifying the stimulus e.g. increased blood pressure, response is increasing blood pressure