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Explain simple reflex action (arch) with the help of a well-labeled diagram depicting a transverse section of the spinal cord and nervous pathway of reflex action.

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Spinal Reflex Arch: 

  • The nerve pathway involved in a reflex action is called a reflex arch. 
  • It includes the following 5 parts – 

1.Sensory organ: Receptors on the body which receive an external or internal stimulus.

2.Sensory Nerve: Sensory nerve carries impulse from sensory organs to the spinal cord.

3. The nerve centre of spinal cord or Interneurons Centre of actions. 

4. Motor nerve: Transmit, impulse away toward the spinal cord. 

5.Effector organs: These organs complete their actions with a response to impulses received through a motor nerve.

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