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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

A nerve fibre is insulated by myelin sheath which ensures unidirectional flow.

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B

Neurotransmitters are naturally attracted towards the brain.

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C

Neurotransmitters are released by dendrites and not by axon endings.

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D

Neurotransmitters are released by the axon endings and not by dendrites.

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Solution

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

A nerve is a set of neurons. Each neuron release chemicals into the synaptic cleft to stimulate the next neuron. The chemicals are stored and released at only one end of the neuron, i.e, at the ends of the axons. Hence, transmission is in one direction for each neuron- denrtites to axons to dentrites of the next neuron.

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Similar questions

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

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

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. 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.

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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