HOW DO REFLEX ACTION WORK

Organs for Hand Reflex:
- Motor Neuron 
   Carries nerve impulse from spinal cord to biceps muscle
 - Biceps Muscle
Contract to bend arm
- Sensory Neuron
  Carries nerve impulse from pain receptor to spinal cord
- Pain Receptor
  In skin of finger

IF YOU PUT YOUR HAND ON A HOT SURFACE, YOU AUTOMATICALLY JERK IT AWAY. IF AN OBJECT MOVES UNEXPECTEDLY TOWARDS YOUR EYES, YOU AUTOMATICALLY BLINK. BOTH OF THESE DEFENSIVE MOVEMENT ARE EXAMPLE OF REFLEX ACTION. REFLEX ACTION ENABLE YOU TO RESPOND RAPIDLY TO SOMETHING THAT MAY BE DANGEROUS, WITHOUT EVEN THINKING ABOUT IT.