nerve impulse
LowTechnical/Scientific
Definition
Meaning
The electrical signal that travels along a neuron (nerve cell), transmitting information throughout the nervous system.
The fundamental unit of communication in the nervous system, involving a rapid, temporary change in the electrical potential across a neuron's membrane, enabling sensation, thought, and action.
Linguistics
Semantic Notes
A specialized, concrete biological term. The concept is central to neuroscience and physiology but is rarely used in everyday conversation.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling follows regional norms for accompanying text (e.g., fibre/fiber).
Connotations
Purely technical and neutral in both varieties.
Frequency
Equally low in both, confined to academic and medical contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
The [sensory receptor] generates a nerve impulse.A nerve impulse travels [along/down] the axon.The [myelin sheath] speeds up the nerve impulse.[Neurotransmitters] are released when the nerve impulse arrives.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None. It is a literal, technical term.”
Usage
Context Usage
Business
Virtually never used.
Academic
Core term in biology, neuroscience, psychology, and medicine.
Everyday
Rarely used outside of educational or health-related discussions.
Technical
The precise term for the electrochemical event in neuronal communication.
Examples
By Part of Speech
verb
British English
- The signal is impulse**d** along the fibre.
- The neuron failed to impulse.
American English
- The signal is impulse**d** along the fiber.
- The neuron failed to impulse.
adverb
British English
- The signal travelled impulse-wise down the axon. (Rare/technical)
- The neuron fired impulse-fashion. (Rare/technical)
American English
- The signal traveled impulse-wise down the axon. (Rare/technical)
- The neuron fired impulse-fashion. (Rare/technical)
adjective
British English
- The impulse conduction velocity was measured.
- They studied impulse propagation.
American English
- The impulse conduction velocity was measured.
- They studied impulse propagation.
Examples
By CEFR Level
- Pain is a signal sent to your brain by a nerve impulse.
- The doctor explained how a nerve impulse makes a muscle move.
- The myelin sheath insulates the axon, allowing the nerve impulse to travel much faster.
- A synapse is the gap where a nerve impulse passes from one neuron to another.
- The research focused on how specific ions govern the depolarisation phase of the nerve impulse.
- Pharmacological agents can alter the threshold required to generate a nerve impulse.
Learning
Memory Aids
Mnemonic
Think of a nerve impulse like a text message (the signal) travelling very fast along a fibre-optic cable (the neuron).
Conceptual Metaphor
ELECTRICAL SIGNAL / MESSAGE / SPARK
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid calquing as "нервный импульс" in a psychological sense (e.g., acting on impulse). In English, 'nerve impulse' is strictly biological. The Russian "импульс" is broader.
Common Mistakes
- Using 'nerve impulse' to mean a sudden desire or whim (that's just 'impulse').
- Confusing 'nerve impulse' with 'reflex arc' (the latter is the entire pathway).
- Saying 'nerve impulse' for the chemical part (neurotransmitter) of the process.
Practice
Quiz
What is the primary function of a nerve impulse?
FAQ
Frequently Asked Questions
Essentially, yes. 'Action potential' is the more precise term for the electrochemical event, while 'nerve impulse' often refers to the travelling of that event along the neuron.
Speeds vary greatly, from about 0.5 metres per second in small, unmyelinated fibres to over 120 metres per second in large, myelinated motor neurons.
No, individual nerve impulses are microscopic electrical events. However, the collective result of many impulses (e.g., in a muscle) is what we perceive as movement or sensation.
Unlike a simple wire, a nerve impulse is a regenerative, self-propagating wave that involves complex chemistry (ion movement) and is not a flow of electrons but of ions like sodium and potassium.