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Doctors Medicines MCQs Q&A

  1. It occurs at the synapses between nerves.
  2. It is innate; does not need to be taught.
  3. It involves stimulation of gustatory receptors.
  4. It is controlled by the cerebral hemispheres.
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1 Answers

Option 2 : It is innate; does not need to be taught.

The correct answer is It is innate; does not need to be taught.

Concept:

Nervous system:

  • The nervous system of all animals is composed of highly specialized cells called neurons.
  • Neurons can detect, receive and transmit different kinds of stimuli. 
  • The human nervous system consists of the brain, spinal cord, and nerves. 

Explanation:

Reflex action: 

  • It is an extremely quick, automatic, sudden action in response to a stimulus.
  • It does not need to be taught. It is an innate characteristic.
  • It occurs involuntarily, i.e., without conscious effort or thought. So, it is not controlled by cerebral hemispheres.
  • A stimulus is a change in the environment to which an organism responds. It can be heat, sharp objects, light, etc.
  • 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.
  • The pathway of nerves involved in a reflex action is called reflect arc. 

  • Synapse: It is the gap between two neurons. 
  • Gustatory receptors: They present on the papillae of the tongue and are used for detecting taste.
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