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Neurons have three main parts: 1  Cell body or Soma: it is the main part of the cell, the one that makes all metabolism and functions. It is very similar to other body cells, except for the difference that neurons do not replicate.  Axon: it is the longest and most important part of the neuron, it transmit the impulse.
Background. Thyroid hormone is responsible for the regulating the metabolic rate of every cell in the body Since every cell in the body depends on its metabolism to perform its function, when the thyroid system is malfunctioning it can affect every system of the body.ackground. Thyroid hormone is responsible for the regulating the metabolic rate of every cell in the body Since every cell in the body depends on its metabolism to perform its function, when the thyroid system is malfunctioning it can affect every system of the body.