Define reflex arc and its component.

Answer:

Reflex or a reflex action is an involuntary action in response to a stimulus. This is a spontaneous action without thinking. For example, we adjust our eyes when exposed to bright light. The peripheral nervous system (PNS) is a system of nerves which connect the central nervous system (CNS) (includes the brain and spinal cord) with other parts of the body. Reflex action is the result of the coordination of the spinal cord and peripheral nervous system. This action does not involve the brain. The pathway in which impulses travel during the reflex action is called a reflex arc.

The components of the reflex arc are

  • Receptor
  • Sensory neurons
  • Association neurons
  • Motor neurons
  • Effector.

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