homeostasis/feedback loops

  1. Explain what positive feedback is
    • Moving away from a target set point through amplification.
    • sensor needs greater stimulus
  2. how do we maintain our enviornments
    through homeostasis (the usage of positive and negative feedback loops)
  3. Explain what negative feedback is
    • trying to stabalize toward a certain target set point going possibly above and below the target until it is reached
    • stimulus, sensor, control center, effector, stimulus
  4. example of negative feedback
    • temp regulation, glucose levels, etc.
    • temp reg- glands open and sweat evaporates to take heat away to make temp drop but if it drops too far glands close and goosebumps pulls skin in.
  5. example of positive feedback
    • in childbirth, a baby's head pushing on a mothers cervix causes contractions which pushes more pressure on the cervix causes more contractions and so on.
    • or fruit ripening which releases a gas that causes other apples to ripen and then those apples release a gas to make more apples ripe and so on
  6. Receptor
    sensor- detect changes in the body and sends signals to the control center (usually the brain)
  7. afferent pathway
    signal traveling to the control center
  8. control center
    receives signal and initiates adjustments
  9. efferent pathway
    command from the control center
  10. effector
    organ or system that receives or executes a command
  11. examples of homeostasis between two systems
    Blood pressure needs 120/80- circulatory, muscular, endocrine, and urinary systems work together to maintain a normal level
Card Set
homeostasis/feedback loops
homeostasis and positive and negative feedback loops