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NEET2007ZoologyNeural Control and CoordinationActual

Which one of the following pairs of structures distinguishes a nerve cell from other types of cell?

Options

  1. Avacuoles and fibres
  2. Bflagellum and medullary sheath
  3. Cnucleus and mitochondria
  4. Dperikaryon and dendrites.

Correct answer

D. perikaryon and dendrites.

Step-by-step solution

A nerve cell consists of cell body (perikaryon) containing the nucleus, Nissl granules, dendrites and an axon. These are specialised cells meant for the transmission of the nerve. Related Theory The main functions of the myelin sheath in neuron are: (I) It acts as an electrical insulator for the neuron. (2) The sheath prevents the movement of ions into or out of the neuron, thus preventing depolarisation. (3) It speeds up transmission of an electrical impulse in the neuron - impulses cannot travel through the sheat

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