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Circulatory system

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Definition: circulatory system from

Chambers 21st Century Dictionary

noun: anatomy, zoology the network of blood vessels which, along with the heart, transport materials such as blood, lymph, etc around the body. Also called cardiovascular system.

Summary Article: circulatory system from The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide
System of vessels in an animal's body that transports essential substances (blood or other circulatory fluid) to and from the different parts of the body. It was first discovered and described by English physician William Harvey. All animals except for the most simple – such as sponges, jellyfish, sea anemones, and corals – have some type of circulatory system. Some invertebrates (animals without a backbone), such as insects, spiders, and most shellfish, have an "open" circulatory system which consists of a simple network of tubes and hollow spaces. Other invertebrates have pump-like structures that send blood through a system of blood vessels. All vertebrates (animals with a backbone), including humans, have a "closed" circulatory system which principally consists of a pumping organ – the heart – and a network of blood vessels. Fish have a single circulatory system in which blood passes...    Continue Reading
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