smooth muscle: meaning, definition, pronunciation and examples
C1Technical/Academic (primarily medical, biological, anatomical)
Quick answer
What does “smooth muscle” mean?
A type of involuntary, non-striated muscle found in the walls of internal organs like the stomach, intestines, and blood vessels.
Audio
Pronunciation
Definition
Meaning and Definition
A type of involuntary, non-striated muscle found in the walls of internal organs like the stomach, intestines, and blood vessels.
In biology and medicine, it refers to muscle tissue that contracts slowly and automatically, controlled by the autonomic nervous system, in contrast to skeletal muscle. It can also be used metaphorically to describe steady, involuntary processes.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling remains consistent ('muscle'). Pronunciation of 'muscle' may show slight variation.
Connotations
Identical technical connotations in both dialects.
Frequency
Equally low frequency in general language but standard and identical in medical/academic contexts in both regions.
Grammar
How to Use “smooth muscle” in a Sentence
The [organ] contains smooth muscle.Smooth muscle [verbs: contracts, relaxes, lines] the [structure].[Substance] acts on smooth muscle.A contraction of the smooth muscle...Vocabulary
Collocations
Examples
Examples of “smooth muscle” in a Sentence
verb
British English
- The drug is designed to smooth-muscle the bronchial passages. (Note: highly technical and rare use, often hyphenated)
American English
- The treatment aims to smooth muscle the arterial walls. (Rare and technical)
adverb
British English
- The vessel contracted smooth-muscle slowly. (Extremely rare and non-standard)
American English
- Not used as an adverb.
adjective
British English
- The smooth-muscle layer is quite thick. (As a compound adjective, often hyphenated)
American English
- Researchers observed smooth muscle activity in the specimen. (Often used attributively without hyphen)
Usage
Meaning in Context
Business
Virtually never used.
Academic
Core term in human biology, physiology, medicine, and anatomy courses and textbooks.
Everyday
Extremely rare outside of specific health discussions or educational contexts.
Technical
The primary register. Used in medical reports, pharmacological research (e.g., drug effects on smooth muscle), and physiological descriptions.
Vocabulary
Synonyms of “smooth muscle”
Strong
Neutral
Weak
Vocabulary
Antonyms of “smooth muscle”
Watch out
Common Mistakes When Using “smooth muscle”
- Mispronouncing 'muscle' as /ˈmʌs.kjuːl/ (like 'musical' without the 'ic').
- Using it to refer to any soft muscle or lack of muscle definition in bodybuilding.
- Confusing it with tendons or ligaments.
FAQ
Frequently Asked Questions
No, smooth muscle is involuntary. It is controlled by the autonomic nervous system.
Smooth muscle cells lack striations (stripes), giving them a smooth appearance, whereas skeletal muscle cells have a very distinct striped pattern.
Not directly through voluntary exercise like weightlifting. Its function is influenced by overall health, diet, and specific medications, but not by targeted 'workouts'.
No, the heart is made of a specialized type of involuntary muscle called cardiac muscle, which is striated like skeletal muscle but functions automatically like smooth muscle.
A type of involuntary, non-striated muscle found in the walls of internal organs like the stomach, intestines, and blood vessels.
Smooth muscle is usually technical/academic (primarily medical, biological, anatomical) in register.
Smooth muscle: in British English it is pronounced /smuːð ˈmʌs.əl/, and in American English it is pronounced /smuð ˈmʌs.əl/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None. It is a purely technical term.”
Learning
Memory Aids
Mnemonic
Think of your stomach smoothly and involuntarily churning food – that action is powered by SMOOTH MUSCLE. No stripes (striations) = smooth.
Conceptual Metaphor
Often conceptualized as a steady, background operator (vs. the deliberate 'actor' of skeletal muscle). Can be metaphorically extended to describe slow, automatic systems: 'The smooth muscle of bureaucracy slowly processed the application.'
Practice
Quiz
Where would you NOT expect to find smooth muscle tissue?