Nervous Communication

• What helps organisms survive?

  responding to their external environment
• How do animals increase their chances of survival?

  By responding to changes in their external environment and internal environment
• Why do animals respond to changes in their internal environment?

  To ensure that the conditions are always optimal for their metabolism
• How do plants increase their chances of survival?

  response to environment
• what is a stimulus?

  any change in the internal or external environment
• What do receptors do?

  detect stimli
• what can receptors be?

  cells or proteins on cell surface membranes
• different types of receptors detect different stimuli
• What are effectors?


  Cells that brings about a response to a stimulus, to produce and effect
• What do effectors include?

  Muscle cells, cells found in glands
• How do receptors COMMUNICATE with effectors?

  VIA the nervous system or hormonal system, or both
• What are receptors.......?


  Receptors are specific to one type of stimulus