1.

Point out differences between: (i) Neuron and Neuroglia, (ii) Nerve fibre and muscle fibre, (iii) Myelinated nerve fibres and non-myelinated nerve fibres.

Answer»

(i) Differences between Neuron and Neuroglia:

S.NoNeuronNeuroglia
(i)They have two types of processes: axon and dendron.Processes are of only one type.
(ii)They may have synapse.Do not have synapse.
(iii)They have no power of division.Have power of division.
(iv)Conduct nerve impulses.Serve as packing cells but nutritive and defensive in function.

(ii) Differences between nerve fibre and muscle fibre:

S. No.Nerve fibreMuscle fibre
(i)Nerve fibres are made up of cells called neurons.Muscles fibres are made up of striated cells, cardiac or unstriated cells.
(ii)Never fibres are involved in the trans - mission of nerve impulses.Contraction of muscles fibers leads to locomotion and movement.

(iii) Differences between myelinated and nonmyelinated nerve fibres:

S. No.Myelinated nerve fibresNon-myelinated nerve fibres
(i)They have a myelin sheath over them.Myelin sheath is absent in them.
(ii)It acts as insulator and the speed of nerve impulse is faster.Speed of nerve impulse is slower in them.
(iii)Found in white matter of brain.Found in autonomic nerves.


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