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The Human Body

Body Systems Work Together

Body Systems Work Together
Reading Level
     edHelper's suggested reading level:   grades 5 to 8
     Flesch-Kincaid grade level:   8.29

Vocabulary
     challenging words:    endocrine, lymphatic, reproductive, urinary, dioxide, electrical, carbon, pipes, connective, meaning, affected, excretory, furnace, digestive, properly, lines

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Body Systems Work Together
By Cindy Grigg 		  
1     You know that your body is made of cells. When groups of cells do the same kind of work, they are called tissues. The word tissue comes from a Latin word meaning to "weave." Cells that make up tissues are sometimes "woven" together.
 
2     You have four main types of tissues: epithelial, nervous, muscle, and connective tissue. Epithelial tissue covers the outside of the body. It also lines organs and cavities. Nervous tissue sends electrical signals. Muscle tissue helps you move. Connective tissue joins bones and cushions organs.
 
3     When groups of tissues work together, they are called organs. Some examples of organs are the heart, lungs, skin, and stomach. When organs work together, they are called systems. For example, your heart, lungs, blood, and blood vessels work together. They make up the circulatory system.

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