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Nerve Impulse Conduction

Unidirectiona...

Question

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

A

Neurotransmitters are released by dendrites and not by axon endings

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B

Sodium pump starts operating only at the cyton and then continues into the nerve fibre

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C

Neurotransmitters are released by the axon endings and not by dendrites

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D

Nerve fibre is insulated by a medullary sheath

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Solution

The correct option is C
Neurotransmitters are released by the axon endings and not by dendrites

The transmission of the impulse occurs via release, diffusion, receptor binding of neurotransmitter molecules and unidirectional communication between neurons. Neurotransmitters are released at axon terminals. The axons transmit nerve impulses away from the cell body to a synapse or to a neuro-muscular junction.

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Q. Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that,

Q. Question 21
Which of the following statements about transmission of nerve impulse is incorrect?

(a) Nerve impulse travels from dendritic end towards axonal end.
(b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron.
(c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron.
(d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.

A myelinated nerve fibre is enveloped by Schwann cells, which form a myelin sheath around the axon.

An unmyelinated nerve fibre is not enclosed by a Schwann cell and hence does not form a myelin sheath around the axon.

Q. Transmission of nerve impulses through nerve fibres are unidirectional because

Q. Consider the following statements and find out coorect option:
(a) Three are two types of axons, namely myelinated and non myelinated
(b) Myelinated nerve fibres found in autonomous and the somatic neural systems
(c) The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(d) The gap between two adjacent myelin sheaths are calleds nodes of Ranvier.
(e) Unmyelinated nerve fibre found in spinal and cranial nerves
(f) Unmyelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon.

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