Dictionary » N » Nerve impulse

Nerve impulse

Definition

noun

(1) The movement of action potential along a nerve fiber in response to a stimulus (such as touch, pain, heat or cold).

(2) The relaying of a coded signal that travels along a nerve cell membrane to an effector, such as muscle, gland or another nerve cell.


Supplement

A nerve impulse is the relaying of a coded signal from a nerve cell to an effector (a muscle cell, a gland cell or another nerve cell) in response to a stimulus. It is the means by which a nerve cell communicates with another cell. This signal is relayed along the axon of the nerve cell, bringing a message that instructs an effector to act. For instance, in neuromuscular junction, the nerve impulse moves along the axon of a nerve cell to instruct a muscle cell to contract.


Word origin: nerve + impulse

See also: action potential.


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Why do neurones only have one axon?

... is would having multiple axons on a neurone speed up transmission of a nerve impulse and the answer to this i do not believe to be yes because neurones are insulated ( ...

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by Drredfrizzle
Sun Nov 11, 2012 7:46 pm
 
Forum: Human Biology
Topic: Why do neurones only have one axon?
Replies: 1
Views: 2485

Neurons, Cocaine, and Shingles

... b) remains in the synapse longer than normal c) increases the speed of nerve impulse transmission d) diffuses rapidly throughout the pleasure centres of the brain 2. A ...

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by homeworkdisaster
Sun Jun 10, 2012 8:11 pm
 
Forum: Human Biology
Topic: Neurons, Cocaine, and Shingles
Replies: 4
Views: 4131

Nervous system

... cause problems. Hint :Specifically, which speech area? Remember that nerves from one side of the body cross over to the other brain hemisphere ... attached to a mass. If an electrical stimulus is sufficient to cause an impulse in the neuron, the muscle will contract and life the mass. The following ...

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by Catherine89
Sun Feb 05, 2012 7:22 pm
 
Forum: Human Biology
Topic: Nervous system
Replies: 0
Views: 3755

Re:

... interneurons that are responsible for relaying information, whereas nerve endings that actually receive tactile information (corpuscles, etc.) ... body. Axons are just propagating the signal. I agree because the nerve impulse is generated at the axon hillock, not in the axon itself.

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by aptitude
Mon Sep 12, 2011 2:19 am
 
Forum: Human Biology
Topic: Axons generate impulse or transfers information
Replies: 2
Views: 3577

Axons generate impulse or transfers information

I know the fact that, if the total strength of the nerve signal exceeds the threshold at axon hillock, it triggers an action potential. But if someone asks me a question about axon being the nerve impulse generator or the structure responsible for transfer of information, then I ...

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by itsmridecide
Wed Jul 27, 2011 7:38 am
 
Forum: Human Biology
Topic: Axons generate impulse or transfers information
Replies: 2
Views: 3577
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