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Circulatory System
 The Heart (Grades 5 to 6)

The Heart (Grades 5 to 6)
Reading Level
     edHelper's suggested reading level:   grades 5 to 6
     Flesch-Kincaid grade level:   5.03

Vocabulary
     challenging words:    covering, ventricle, involuntary, valve, therefore, works, separate, pumps, muscle, heartbeat, during, upper, lower, heart, actually, working

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The Heart
By Jennifer Kenny 		  
1     The heart is the strong muscle which pumps blood throughout your body. It is a hollow muscle, about the size and shape of a fist. It is actually made up of two separate pumps. It is called an involuntary muscle because it works without you ever having to think about it working. Isn't that amazing? You'd never get anything done if you always had to think about making your heart beat!
 
2     The heart is located between the lungs and behind your rib cage. It is in a slanting position in the center of the chest. The pericardium is a covering that keeps the heart from rubbing against your lungs and chest wall.
 
3     The heart has four chambers in it (right atrium, left atrium, right ventricle, and left ventricle). The muscular wall called the septum divides the two sides of the heart. Blood can't pass from one side to the other.

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