What is the role of the brain in reflex action?


-Kumudinee, Subject Matter Expert at Edumarz

Solution: Reflex actions are sudden and spontaneous. It happens involuntarily without thought process in response to the stimuli. For example, blinking of eyelashes when some dust enters eyes. 

Events that precede a stimulus in an organism:

  • At the very first receptor detects the stimulus from a sensory organ. The stimulus could be temperature, pressure, aroma, sound etc.

  • Then the relay neuron transmits the signal to the motor neuron.

  • The motor neuron then sends a signal to the effector organs or cells that act to the stimulus.

  • Finally the instantaneous response is given by the effector organ or cells. 

  • Here connections where signals are detected by nerves and response is  given quickly are known as reflex arcs

  • The reflex arm is formed in the spinal cord by motor neurons and the information is still sent to the brain but the brain doesn’t have a significant response to it.

  • This is why reflex actions are involuntary in nature.


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