Reflexes

• Reflex


  An automatic response to a stimulus that doesn't involve processing by the brain (e.g. blinking or coughing)
• Reflex


  • Fast response
  • Involves only a few neurons (nerve cells)
• Reflex arc

  1. Message from pain receptors to

  2. Sensory nerve to

  3. Interneuron in spinal cord to

  4. Motor neuron that makes muscle react
• A message is also sent to the brain but you have reacted almost before the brain registers
• More complex actions require messages to be sent to the brain
• Reflex arc flow chart starts here and finishes here
• Advantages of reflex arc


  • Very quick to happen
  • Don't need to learn
  • Don't need to think to make a decision
  • Aids in survival as it protects body from further harm
  • Reduces energy required in body functions