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What is blood?
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Blood contains red and white blood cells that float inside a liquid called plasma. It also contains thousands of different substances needed by the body. Blood carries all these things around the body and also removes waste products. It is part of the body's communication system, carrying chemical messengers called hormones that switch organs on and off as required.

Blood carries the white cells and chemical substances that attack invading bacteria and viruses.

It also helps control body read more...

Tags: blood, cells, plasma, body

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Discuss : What is blood? ... on Forum


Category: Education

Date Added: 21 Dec '11


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