Myelinated axons transmit impules faster than unmyelinated axons .

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

Write down the role of myelin sheath in the myelinated axons.

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.

Differentiate between : Myelinated and non-myelinated axons

What is myelin ? How are myelinated neurons differnet from unmyelinated neurons ?

The axon terminals of nerves contains

The axon terminals of nerves contains

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.

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

Draw a diagram to show the structure of a neuron with myelinated axon and label any six parts in it.