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cardiac muscle
noun
: the principal involuntary-muscle tissue of the vertebrate heart made up of striated fibers joined at usually branched ends and functioning in synchronized rhythmic contraction
Examples of cardiac muscle in a Sentence
Recent Examples on the Web
Muscle mass refers to the total amount of muscle in the body, including skeletal muscle mass and cardiac muscles.
—Andi Breitowich, Women's Health, 4 Aug. 2023
There are three main types of muscle tissue: smooth muscle lines the gut wall and organs, except the heart; cardiac muscle is striated and covers the heart; and skeletal muscle, which can be found in the arms and legs, is also striated.
—Lauren J. Young, Scientific American, 2 July 2023
Decreased autophagy in cardiac muscle cells results in accumulating cellular garbage that can affect their ability to contract and even cause their death.
—Justin Quiles, The Conversation, 8 Feb. 2023
That is, their collaterals can completely reroute the blood flow after any blockage in the coronary arteries, so there’s no cardiac muscle death.
—Quanta Magazine, 13 Feb. 2023
With fewer cells and less contraction, the buildup of toxic material in cardiac muscle cells can ultimately lead to heart failure.
—Justin Quiles, The Conversation, 8 Feb. 2023
But because the heart has its own needs too, some of those vessels form a filigree of coronary arteries that laces through the cardiac muscle.
—Quanta Magazine, 13 Feb. 2023
The researchers used a variety of blood tests to look for proteins that normally reside inside cardiac muscle cells but can be released into the blood when those cells get damaged.
—John Timmer, Ars Technica, 3 Sep. 2020
Probably due to a lack of calcium, which helps sustain cardiac muscle contraction.
—Dena Rifkin, Discover Magazine, 4 Dec. 2011
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'cardiac 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
1846, in the meaning defined above
Dictionary Entries Near cardiac muscle
Cite this Entry
“Cardiac muscle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cardiac%20muscle. Accessed 15 Jul. 2024.
Medical Definition
cardiac muscle
noun
: the principal muscle tissue of the vertebrate heart that is made up of elongated striated muscle fibers each of which consists of a single cell that has an intrinsic rhythm of contraction and relaxation even when isolated, is joined physically at its often branched ends to other such cells by intercalated discs, and in intact myocardial tissue is synchronized to function in contraction especially by electrical signals of extrinsic origin passing through gap junctions in the intercalated discs compare smooth muscle, striated muscle
More from Merriam-Webster on cardiac muscle
Britannica.com: Encyclopedia article about cardiac muscle
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