smooth muscle

noun

Definition of smooth muscle

: 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 Too much calcium could increase the risk of kidney stones, while toxic levels of vitamin D can cause calcium to deposit in smooth muscle tissue, which is found around organs in the digestive, respiratory and reproductive tracts, Young added. Lisa Drayer, CNN, "Should you take a dietary supplement to prevent disease?," 24 June 2020 Hormonal changes during pregnancy and breastfeeding may promote the relaxation of smooth muscles, Dr. Lukacz said. Katherine Hobson, New York Times, "Peeing Your Pants After Pregnancy Is Preventable," 17 Apr. 2020 The arc of hexagons above her left eyebrow is speciogynine, thought to be a smooth muscle relaxer. Emma Grey Ellis, Wired, "Release the Kratom: Inside America's Hottest New Drug Culture," 22 Jan. 2020 That's because pregnancy hormone progesterone causes the smooth muscles in both the esophagus and bowel to relax. Felissa Allard, SELF, "These Are The Pregnancy Pains You Shouldn’t Ignore," 8 July 2019 Under sedation, a small catheter is introduced through a bronchoscope to deliver a safe amount of heat to reduce excess smooth muscle in the lungs. Tracy Maness, Houston Chronicle, "Treatment helps adults manage asthma at Memorial Hermann Greater Heights," 30 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'smooth muscle.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of smooth muscle

circa 1890, in the meaning defined above

Keep scrolling for more

Learn More about smooth muscle

Time Traveler for smooth muscle

Time Traveler

The first known use of smooth muscle was circa 1890

See more words from the same year

Statistics for smooth muscle

Cite this Entry

“Smooth muscle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/smooth%20muscle. Accessed 22 Sep. 2020.

Keep scrolling for more

More Definitions for smooth muscle

smooth muscle

noun

Medical Definition of smooth muscle

: 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

Britannica.com: Encyclopedia article about smooth muscle

Comments on smooth muscle

What made you want to look up smooth muscle? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Homophone Quiz

  • three bears two of them look like theyre whispering to a third bear who looks chuffed to be the center of attention
  • In order to judge how people felt, the senator's office hired a firm to take a ______.
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!