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Impulses travel much more rapidly along ...

Impulses travel much more rapidly along myelinated nerve

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Assertion : Myelin sheath insulates the nerve fibre and prevents its depolarisation. Reason : Nerve impulses are conducted more rapidly in non-myelinated nerve fibres than in myelinated ones.

Nerve impulses are conducted more rapidly in myelinated fibres than in non-myelinated fibres.

Knowledge Check

  • Assertion:Myelinated nerve fibres are present in spinal and cranial nerves. Reason:Myelinated nerves conduct impulses more radidly than unmyelinated nerves.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Read the given statements and select the correct ones. (i)Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body. (ii)Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath. (iii)Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K^+) than to sodium ions (Na^+) (iv)A synapse is formed by the membranes of presynaptic neuron and a post synaptic neuron.

    A
    (i) and (iv)
    B
    (ii) and (iii)
    C
    (iii) and (iv)
    D
    (i) and (iv)

  • Read the given statements and select the correct option. (i)Synaptic cleft of neurons secreates adrenaline. (ii)Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon. (iii)Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath. (iv)Spinal and cranial nerves are made of non-myelinated nerve fibres.

    A
    Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrect.
    B
    Statements (i), (ii) and (iii) are correct but statement (iv) is incorrect.
    C
    Statements (iii) and (iv) are correct but statements (i) and (ii) are incorrect.
    D
    Statement (ii) and (iii) are correct but statements (i) and (iv) are incorrect.

    • Similar Questions

    Explore conceptually related problems

    Distinguish between the following pairs : Conduction of nerve impulse in myelinated and non myelinated nerve fibres

    What is action potential? Describe how the nerve impulse is propagated in a non-myelinated and myelinated nerve fibre.

    Why is the mode of conduction of electrical impulse along the myelinated neuron advantageous to a non mmyelinated neuron ? What is this type of conduction called ?

    Which of the following has non-myelinated nerve fibre

    Read the given statements and select the correct option. (i)Synaptic cleft of neurons secreates adrenaline. (ii)Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon. (iii)Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath. (iv)Spinal and cranial nerves are made of non-myelinated nerve fibres.

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