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Organs are made up from different types of tissue that are grouped together to carry out a particular body function.
The heart, for example, is a collection of muscle tissue, connective tissue and nervous tissue. These tissues work together to pump blood around the body.
Different types of organs are in turn grouped together to form systems, such as the circulatory system. It includes the heart and all the body's blood vessels. The digestive system includes the mouth, gullet, stomach and i
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Tags: heart,
body,
human
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