circulatory system


Definition of circulatory system

: the system of blood, blood vessels, lymphatics, and heart concerned with the circulation of the blood and lymph

Examples of circulatory system in a Sentence

Recent Examples on the Web

The heart acts as a powerful pump that generates the force necessary to move the blood around the circulatory system. Svenja Lohner, Scientific American, "Build a Blood-Flow Model," 15 Aug. 2019 In Minnesota, surgeons stood inside a VR model of the circulatory systems of conjoined twins—which proved integral to the ensuing separation surgery. Peter Rubin, WIRED, "Blow Out Your Knee? Hope Your Surgeon's Got a VR Headset," 9 Aug. 2019 This marine circulatory system has reached its weakest point in 1,600 years, recent studies show, having lost about 15 percent of its strength since the mid-20th century. David Fleshler,, "A weaker Gulf Stream may lead to rising seas and a hotter Florida," 2 Aug. 2019 There are examples of circulatory systems in nature that are even more efficient than our own. Emily Toomey, Smithsonian, "Engineers Built a Robotic Lionfish With an Energetic Bloodstream," 19 June 2019 Advertising The heart keeps our blood moving throughout the circulatory system at a regular clip. Elizabeth Kiefer, The Seattle Times, "Jade rollers: Puffy-eye wonder cure or sham?," 26 Mar. 2019 The buildings’ circulatory system — water pipes and electrical conduits — ran along the wall on one side. John Kelly, Washington Post, "A massive mural in an underground District tunnel is finally seeing the light," 23 July 2019 The part of the circulatory system (called the vascular system in plants) that carries the food (basically sugar water) is located just below the bark and is called the phloem. Dan Gill,, "How to care for a damaged tree trunk," 18 May 2019 Children have difficultly escaping a hot car on their own, and their respiratory and circulatory systems can't handle heat as well as those of adults. Kristin Lam, USA TODAY, "1-year-old boy dies in Texas after being left in hot car, police say; 13th death nationally in 2019," 23 June 2019

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

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First Known Use of circulatory system

1862, in the meaning defined above

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Statistics for circulatory system

Last Updated

19 Aug 2019

Look-up Popularity

Time Traveler for circulatory system

The first known use of circulatory system was in 1862

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More Definitions for circulatory system

circulatory system


Kids Definition of circulatory system

: the system of the body that circulates blood and lymph and includes the heart and blood vessels

circulatory system


Medical Definition of circulatory system

: the system of blood, blood vessels, lymphatics, and heart concerned with the circulation of the blood and lymph

More from Merriam-Webster on circulatory system

Britannica English: Translation of circulatory system for Arabic Speakers Encyclopedia article about circulatory system

Comments on circulatory system

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


not constant or steady

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