Which of the following is not a function of neurons?
Receive information
Conduct a signal
Form the myelin sheath
Co-ordinate metabolic activities
A
Receive information
B
Form the myelin sheath
C
Co-ordinate metabolic activities
D
Conduct a signal
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Solution
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Sensory neurons receive sensory inputs from the internal and external environment and transmit it to CNS (brain and spinal cord) for processing. Motor neurons transmit the nerve impulses from CNS to effectors (muscles and glands). According to the signal, carried by motor nerves to effector organs, the muscles and glands perform their actions (contraction and secretion respectively) and thereby coordinating the metabolic activities.
The two main types of cells of the nervous system are neurons and neuroglia. The myelinated axon fibres are covered with white myelin sheath formed from the membranes of tightly spiraled neuroglia cells. Thus, option C is the correct answer.
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A myelinated nerve fibre is enveloped by Schwann cells, which form a myelin sheath around the axon.
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