smooth muscle

noun

: muscle tissue that lacks cross striations, is made up of elongated spindle-shaped cells having a central nucleus, and is found especially in vertebrate hollow organs and structures (such as the digestive tract and bladder) as thin sheets performing functions not subject to direct voluntary control and in all or most of the musculature of invertebrates other than arthropods compare striated muscle

Examples of smooth muscle in a Sentence

Recent Examples on the Web To stretch that far, the smooth muscle wall that wraps around the bladder, called the detrusor, must relax. Emily Underwood, Smithsonian Magazine, 5 June 2024 The receptors control constriction and dilation in the smooth muscle fibers in the walls of these blood vessels. Kristen Rogers, CNN, 21 Mar. 2024 Antihistamines work by binding to histamine receptors on the brain, spinal cord, smooth muscles, and other tissues of the body. Daniel More, Verywell Health, 9 Mar. 2024 To get things flowing, O’Connor suggests switching to hot water because hot drinks can help smooth muscle relaxation and help out with your bowel movements. Ayana Underwood, SELF, 30 Jan. 2024 See all Example Sentences for smooth muscle 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'smooth muscle.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

circa 1890, in the meaning defined above

Time Traveler
The first known use of smooth muscle was circa 1890

Dictionary Entries Near smooth muscle

Cite this Entry

“Smooth muscle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/smooth%20muscle. Accessed 24 Jul. 2024.

Kids Definition

smooth muscle

noun
: muscle that is made up of long thin cells with a single nucleus and no cross stripes, that is found especially in hollow organs and parts (as the bladder and blood vessels), and that is not under voluntary control

called also involuntary muscle

compare striated muscle

Medical Definition

smooth muscle

noun
: muscle tissue that lacks cross striations, that is made up of elongated spindle-shaped cells having a central nucleus, and that is found especially in vertebrate hollow organs and structures (as the small intestine and bladder) as thin sheets performing functions not subject to direct voluntary control and in all or most of the musculature of invertebrates other than arthropods

called also nonstriated muscle, unstriated muscle

compare cardiac muscle, striated muscle

More from Merriam-Webster on smooth muscle

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