1 of 22© Boardworks Ltd 2011 The Circulatory System

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The Circulatory System

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Human circulatory system

A circulatory system consists of a group of organs that assist the movement of substances, such as oxygen and glucose, around the body.

Humans and other complex organisms have a closed circulatory system where blood is contained within a series of vessels. This allows the speed, pressure and distribution of blood to be controlled.

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Single and double circulatory systems

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Double circulatory system advantages

The double circulatory system produces higher pressures in blood vessels than a single circulatory system can.

This creates a greater rate of blood flow to the tissues.

The greater rate of flow allows blood to be pumped quickly even through the bodies of large mammals, like elephants and whales.

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True or false?

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What is blood made up of?

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Which component?

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Blood vessels

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Which type of blood vessels?

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Gases moving in and out of the blood

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Blood and blood vessels

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Structures of the heart

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The cardiac cycle

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The stages of the cardiac cycle

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Glossary

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Anagrams

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Which structure?

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Multiple-choice quiz