Homeostasis

• What is a homeostasis?


  The regulation of the conditions inside your body to maintain a stable internal environment in response to changes in both internal and external conditions
• What are two types of communication systems?


  Nervous and hormonal
• What are the main three components of automatic control systems?


  receptors,coordination centres (the brain, spinal cord and pancres) and effectors
• What is a negative feedback and why does system use this?


  It is when the level of something gets too high or too low, your body uses negative feedback to bring it back to normal. It keeps internal environment stable.
• What is a stimulus?

  A change in the environment
• What happens when level of something decreases or increases?


  • receptor detects a stimulus
  • the coordination centre receives and processes the information, generates a response
  • effector produces response which counteracts the change and restores the optimum level - the level increases or decreases
• Why does the body need to maintain optimal conditions?

  For optimal enzyme action and cell function
• True or false? Homeostasis ensure internal conditions stay exactly constant, they don't fluctuate at all. 


  False
• What is the role of a receptor? 

  Detects changes in the internal or external environment 
• What is the role of a coordination centre? 

  Interprets changes and organises a response 
• two types of effectors and state what they do

  Muscles contract and glands release hormones
• Is the nervous system or the endocrine system faster acting? 


  Nervous
• Which system acts more generally across the body, the nervous system or the endocrine system?


  Endocrine
• What`s negative feedback?


  whenever the levels of something get too high they're brought back down, and whenever the levels of something get too low, they're brought back up.