circulatory system

noun Anatomy, Zoology.
the system of organs and tissues, including the heart, blood, blood vessels, lymph, lymphatic vessels, and lymph glands, involved in circulating blood and lymph through the body.

Origin:
1860–65

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Collins
World English Dictionary
circulatory system
 
n
anatomy, zoology the system concerned with the transport of blood and lymph, consisting of the heart, blood vessels, lymph vessels, etc

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American Heritage
Medical Dictionary

circulatory system n.
The system of structures, consisting of the heart, blood vessels, and lymphatics, by which blood and lymph are circulated throughout the body. Also called vascular system.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
circulatory system   (sûr'kyə-lə-tôr'ē)  Pronunciation Key 


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The system that circulates blood through the body, consisting of the heart and blood vessels. In all vertebrates and certain invertebrates, the circulatory system is completely contained within a network of vessels (known as a closed circulatory system). In arthropods and many other invertebrates, a substance analogous to blood (known as hemolymph) is pumped through vessels that open into the intercellular spaces (in what is known as an open circulatory system). In vertebrates, the lymphatic system is also considered part of the circulatory system.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

circulatory system definition


The system in the body by which blood and lymph are circulated. The parts of the circulatory system include the heart, along with all the arteries, veins, and capillaries. The organs of the lymphatic system are also considered to be part of the circulatory system. Nutrients, oxygen, and other vital substances are carried throughout the body by the blood, which is pumped by rhythmic contractions of the heart. Blood is pumped from the heart to the arteries, which branch into smaller and smaller vessels as they move away from the heart. The blood passes oxygen and nutrients to the cells and picks up waste in the capillaries, then returns to the heart via a system of veins.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Far more serious is the possibility that the clot, or a piece of it, splits off
  and starts racing round the circulatory system.
His nervous system and his circulatory system were not harmed.
Rotating between hot and cold baths is recommended to stimulate the circulatory
  system.
Fortunately, the plant's circulatory system is visible from the outside.
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