How many neurons comprise the reflex arc from a touch receptor to a muscle?

  1. One
  2. Two
  3. Four
  4. Three

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  1. The correct answer is three.

    Concept:

    Reflex action: 

    • It is an extremely quick, automatic, sudden action in response to a stimulus.
    • For example-
      • Immediately pulling back of fingers after touching a hot plate.
      • Closing of eyes when flashed with a high-intensity light.
      • Salivation when hungry.

    Explanation:

    Reflex arc:

    • It is the pathway of nerves involved in a reflex action.
    • Reflex arc involves-
      • Receptors– The sense organ that receives the message from the external environment.
      • Sensory neuron– The neuron that carries the message from the receptor to the central nervous system.
      • Relay neurons– They are found in the brain and spinal cord and link sensory and motor neurons.
      • Motor neuron– The neuron that carries the message from the central nervous system to the effector.
      • Effector– The organ/body part that responds against the stimulus.

    So, there are three neurons involved in the reflex arc namely, sensory, relay, and motor neuron.

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