The human circulatory system
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I can explain the role of the circulatory system in supplying every living cell in the human body with the substances it needs to stay alive.
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Humans are multicellular organisms; the human body is made up of millions of living cells.
Every cell must be supplied with substances for respiration, growth and repair; waste products must be removed.
The circulatory system transports substances between cells and the gas exchange, digestive and excretory systems.
The circulatory system is made up of the heart, blood vessels and blood.
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